diff --git a/.gitlab/ci/pipelines/before_merging.yml b/.gitlab/ci/pipelines/before_merging.yml
index d08f74db49f225125492aef53fc9905daf80532e..cd521557ce71192f581c3768bf78e0fcdbd75cbb 100644
--- a/.gitlab/ci/pipelines/before_merging.yml
+++ b/.gitlab/ci/pipelines/before_merging.yml
@@ -7105,7 +7105,7 @@ oc.unit:non-proto-x86_64:
     expire_in: 1 day
     paths:
     - test_results
-    - $BISECT_FILE
+    - $BISECT_FILE/$CI_JOB_NAME_SLUG.*
     reports:
       junit: test_results/*.xml
     when: always
@@ -7148,7 +7148,7 @@ oc.unit:other-x86_64:
     expire_in: 1 day
     paths:
     - test_results
-    - $BISECT_FILE
+    - $BISECT_FILE/$CI_JOB_NAME_SLUG.*
     reports:
       junit: test_results/*.xml
     when: always
@@ -7191,7 +7191,7 @@ oc.unit:proto-x86_64:
     expire_in: 1 day
     paths:
     - test_results
-    - $BISECT_FILE
+    - $BISECT_FILE/$CI_JOB_NAME_SLUG.*
     reports:
       junit: test_results/*.xml
     when: always
@@ -7552,7 +7552,7 @@ tezt:
     fail --junit ${JUNIT} --from-record tezt/records --job ${CI_NODE_INDEX:-1}/${CI_NODE_TOTAL:-1}
     --record tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json --job-count ${TEZT_PARALLEL}
     --retry ${TEZT_RETRY}
-  - if [ -n "${BISECT_FILE:-}" ]; then ./scripts/ci/merge_coverage.sh; fi
+  - ./scripts/ci/merge_coverage.sh
   variables:
     JUNIT: tezt-junit.xml
     TEZT_VARIANT: ""
@@ -7570,7 +7570,7 @@ tezt:
     - tezt-*.log
     - tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json
     - $JUNIT
-    - $BISECT_FILE
+    - $BISECT_FILE/$CI_JOB_NAME_SLUG.*
     reports:
       junit: $JUNIT
     when: always
@@ -7619,7 +7619,7 @@ tezt-memory-3k:
     fail --junit ${JUNIT} --from-record tezt/records --job ${CI_NODE_INDEX:-1}/${CI_NODE_TOTAL:-1}
     --record tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json --job-count ${TEZT_PARALLEL}
     --retry ${TEZT_RETRY}
-  - if [ -n "${BISECT_FILE:-}" ]; then ./scripts/ci/merge_coverage.sh; fi
+  - ./scripts/ci/merge_coverage.sh
   variables:
     JUNIT: tezt-junit.xml
     TEZT_VARIANT: -memory_3k
@@ -7637,7 +7637,7 @@ tezt-memory-3k:
     - tezt-*.log
     - tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json
     - $JUNIT
-    - $BISECT_FILE
+    - $BISECT_FILE/$CI_JOB_NAME_SLUG.*
     reports:
       junit: $JUNIT
     when: always
@@ -7685,7 +7685,7 @@ tezt-memory-4k:
     fail --junit ${JUNIT} --from-record tezt/records --job ${CI_NODE_INDEX:-1}/${CI_NODE_TOTAL:-1}
     --record tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json --job-count ${TEZT_PARALLEL}
     --retry ${TEZT_RETRY}
-  - if [ -n "${BISECT_FILE:-}" ]; then ./scripts/ci/merge_coverage.sh; fi
+  - ./scripts/ci/merge_coverage.sh
   variables:
     JUNIT: tezt-junit.xml
     TEZT_VARIANT: -memory_4k
@@ -7703,7 +7703,7 @@ tezt-memory-4k:
     - tezt-*.log
     - tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json
     - $JUNIT
-    - $BISECT_FILE
+    - $BISECT_FILE/$CI_JOB_NAME_SLUG.*
     reports:
       junit: $JUNIT
     when: always
@@ -7752,7 +7752,7 @@ tezt-time-sensitive:
     fail --junit ${JUNIT} --from-record tezt/records --job ${CI_NODE_INDEX:-1}/${CI_NODE_TOTAL:-1}
     --record tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json --job-count ${TEZT_PARALLEL}
     --retry ${TEZT_RETRY}
-  - if [ -n "${BISECT_FILE:-}" ]; then ./scripts/ci/merge_coverage.sh; fi
+  - ./scripts/ci/merge_coverage.sh
   variables:
     JUNIT: tezt-junit.xml
     TEZT_VARIANT: -time_sensitive
@@ -7770,7 +7770,7 @@ tezt-time-sensitive:
     - tezt-*.log
     - tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json
     - $JUNIT
-    - $BISECT_FILE
+    - $BISECT_FILE/$CI_JOB_NAME_SLUG.*
     reports:
       junit: $JUNIT
     when: always
@@ -7819,7 +7819,6 @@ tezt-slow:
     fail --junit ${JUNIT} --from-record tezt/records --job ${CI_NODE_INDEX:-1}/${CI_NODE_TOTAL:-1}
     --record tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json --job-count ${TEZT_PARALLEL}
     --retry ${TEZT_RETRY}
-  - if [ -n "${BISECT_FILE:-}" ]; then ./scripts/ci/merge_coverage.sh; fi
   variables:
     JUNIT: tezt-junit.xml
     TEZT_VARIANT: -slow
@@ -7884,7 +7883,7 @@ tezt-flaky:
     fail --junit ${JUNIT} --from-record tezt/records --job ${CI_NODE_INDEX:-1}/${CI_NODE_TOTAL:-1}
     --record tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json --job-count ${TEZT_PARALLEL}
     --retry ${TEZT_RETRY}
-  - if [ -n "${BISECT_FILE:-}" ]; then ./scripts/ci/merge_coverage.sh; fi
+  - ./scripts/ci/merge_coverage.sh
   variables:
     JUNIT: tezt-junit.xml
     TEZT_VARIANT: -flaky
@@ -7902,7 +7901,7 @@ tezt-flaky:
     - tezt-*.log
     - tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json
     - $JUNIT
-    - $BISECT_FILE
+    - $BISECT_FILE/$CI_JOB_NAME_SLUG.*
     reports:
       junit: $JUNIT
     when: always
@@ -7947,7 +7946,6 @@ tezt:static-binaries:
     fail --junit ${JUNIT} --from-record tezt/records --job ${CI_NODE_INDEX:-1}/${CI_NODE_TOTAL:-1}
     --record tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json --job-count ${TEZT_PARALLEL}
     --retry ${TEZT_RETRY}
-  - if [ -n "${BISECT_FILE:-}" ]; then ./scripts/ci/merge_coverage.sh; fi
   variables:
     JUNIT: tezt-junit.xml
     TEZT_VARIANT: ""
diff --git a/.gitlab/ci/pipelines/schedule_extended_test.yml b/.gitlab/ci/pipelines/schedule_extended_test.yml
index a80706826e497c3e89d6d8f26da5d169d4dfd4a9..6a859d63765b165402656ab5ac929a3f6c9f92f9 100644
--- a/.gitlab/ci/pipelines/schedule_extended_test.yml
+++ b/.gitlab/ci/pipelines/schedule_extended_test.yml
@@ -6759,7 +6759,7 @@ oc.unit:non-proto-x86_64:
     expire_in: 1 day
     paths:
     - test_results
-    - $BISECT_FILE
+    - $BISECT_FILE/$CI_JOB_NAME_SLUG.*
     reports:
       junit: test_results/*.xml
     when: always
@@ -6792,7 +6792,7 @@ oc.unit:other-x86_64:
     expire_in: 1 day
     paths:
     - test_results
-    - $BISECT_FILE
+    - $BISECT_FILE/$CI_JOB_NAME_SLUG.*
     reports:
       junit: test_results/*.xml
     when: always
@@ -6825,7 +6825,7 @@ oc.unit:proto-x86_64:
     expire_in: 1 day
     paths:
     - test_results
-    - $BISECT_FILE
+    - $BISECT_FILE/$CI_JOB_NAME_SLUG.*
     reports:
       junit: test_results/*.xml
     when: always
@@ -7070,7 +7070,7 @@ tezt:
     fail --junit ${JUNIT} --from-record tezt/records --job ${CI_NODE_INDEX:-1}/${CI_NODE_TOTAL:-1}
     --record tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json --job-count ${TEZT_PARALLEL}
     --retry ${TEZT_RETRY}
-  - if [ -n "${BISECT_FILE:-}" ]; then ./scripts/ci/merge_coverage.sh; fi
+  - ./scripts/ci/merge_coverage.sh
   variables:
     JUNIT: tezt-junit.xml
     TEZT_VARIANT: ""
@@ -7088,7 +7088,7 @@ tezt:
     - tezt-*.log
     - tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json
     - $JUNIT
-    - $BISECT_FILE
+    - $BISECT_FILE/$CI_JOB_NAME_SLUG.*
     reports:
       junit: $JUNIT
     when: always
@@ -7127,7 +7127,7 @@ tezt-memory-3k:
     fail --junit ${JUNIT} --from-record tezt/records --job ${CI_NODE_INDEX:-1}/${CI_NODE_TOTAL:-1}
     --record tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json --job-count ${TEZT_PARALLEL}
     --retry ${TEZT_RETRY}
-  - if [ -n "${BISECT_FILE:-}" ]; then ./scripts/ci/merge_coverage.sh; fi
+  - ./scripts/ci/merge_coverage.sh
   variables:
     JUNIT: tezt-junit.xml
     TEZT_VARIANT: -memory_3k
@@ -7145,7 +7145,7 @@ tezt-memory-3k:
     - tezt-*.log
     - tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json
     - $JUNIT
-    - $BISECT_FILE
+    - $BISECT_FILE/$CI_JOB_NAME_SLUG.*
     reports:
       junit: $JUNIT
     when: always
@@ -7183,7 +7183,7 @@ tezt-memory-4k:
     fail --junit ${JUNIT} --from-record tezt/records --job ${CI_NODE_INDEX:-1}/${CI_NODE_TOTAL:-1}
     --record tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json --job-count ${TEZT_PARALLEL}
     --retry ${TEZT_RETRY}
-  - if [ -n "${BISECT_FILE:-}" ]; then ./scripts/ci/merge_coverage.sh; fi
+  - ./scripts/ci/merge_coverage.sh
   variables:
     JUNIT: tezt-junit.xml
     TEZT_VARIANT: -memory_4k
@@ -7201,7 +7201,7 @@ tezt-memory-4k:
     - tezt-*.log
     - tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json
     - $JUNIT
-    - $BISECT_FILE
+    - $BISECT_FILE/$CI_JOB_NAME_SLUG.*
     reports:
       junit: $JUNIT
     when: always
@@ -7240,7 +7240,7 @@ tezt-time-sensitive:
     fail --junit ${JUNIT} --from-record tezt/records --job ${CI_NODE_INDEX:-1}/${CI_NODE_TOTAL:-1}
     --record tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json --job-count ${TEZT_PARALLEL}
     --retry ${TEZT_RETRY}
-  - if [ -n "${BISECT_FILE:-}" ]; then ./scripts/ci/merge_coverage.sh; fi
+  - ./scripts/ci/merge_coverage.sh
   variables:
     JUNIT: tezt-junit.xml
     TEZT_VARIANT: -time_sensitive
@@ -7258,7 +7258,7 @@ tezt-time-sensitive:
     - tezt-*.log
     - tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json
     - $JUNIT
-    - $BISECT_FILE
+    - $BISECT_FILE/$CI_JOB_NAME_SLUG.*
     reports:
       junit: $JUNIT
     when: always
@@ -7296,7 +7296,6 @@ tezt-slow:
     fail --junit ${JUNIT} --from-record tezt/records --job ${CI_NODE_INDEX:-1}/${CI_NODE_TOTAL:-1}
     --record tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json --job-count ${TEZT_PARALLEL}
     --retry ${TEZT_RETRY}
-  - if [ -n "${BISECT_FILE:-}" ]; then ./scripts/ci/merge_coverage.sh; fi
   variables:
     JUNIT: tezt-junit.xml
     TEZT_VARIANT: -slow
@@ -7350,7 +7349,7 @@ tezt-flaky:
     fail --junit ${JUNIT} --from-record tezt/records --job ${CI_NODE_INDEX:-1}/${CI_NODE_TOTAL:-1}
     --record tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json --job-count ${TEZT_PARALLEL}
     --retry ${TEZT_RETRY}
-  - if [ -n "${BISECT_FILE:-}" ]; then ./scripts/ci/merge_coverage.sh; fi
+  - ./scripts/ci/merge_coverage.sh
   variables:
     JUNIT: tezt-junit.xml
     TEZT_VARIANT: -flaky
@@ -7368,7 +7367,7 @@ tezt-flaky:
     - tezt-*.log
     - tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json
     - $JUNIT
-    - $BISECT_FILE
+    - $BISECT_FILE/$CI_JOB_NAME_SLUG.*
     reports:
       junit: $JUNIT
     when: always
@@ -7403,7 +7402,6 @@ tezt:static-binaries:
     fail --junit ${JUNIT} --from-record tezt/records --job ${CI_NODE_INDEX:-1}/${CI_NODE_TOTAL:-1}
     --record tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json --job-count ${TEZT_PARALLEL}
     --retry ${TEZT_RETRY}
-  - if [ -n "${BISECT_FILE:-}" ]; then ./scripts/ci/merge_coverage.sh; fi
   variables:
     JUNIT: tezt-junit.xml
     TEZT_VARIANT: ""
diff --git a/ci/bin/code_verification.ml b/ci/bin/code_verification.ml
index 6cb24120ab6301c5ba9a445004d4b264777cffb4..e7d16f4cc0b05d9cfba82ffc6c15871498822f22 100644
--- a/ci/bin/code_verification.ml
+++ b/ci/bin/code_verification.ml
@@ -272,7 +272,6 @@ let job_tezt ~__POS__ ?rules ?parallel ?(tags = ["gcp_tezt"]) ~name
        ${CI_NODE_INDEX:-1}/${CI_NODE_TOTAL:-1} --record \
        tezt-results-${CI_NODE_INDEX:-1}${TEZT_VARIANT}.json --job-count \
        ${TEZT_PARALLEL} --retry ${TEZT_RETRY}";
-      "if [ -n \"${BISECT_FILE:-}\" ]; then ./scripts/ci/merge_coverage.sh; fi";
     ]
 
 (** Tezt tag selector string.
@@ -381,11 +380,13 @@ let jobs pipeline_type =
       : tezos_job =
     jobs_with_coverage_output := tezos_job :: !jobs_with_coverage_output ;
     tezos_job |> enable_coverage_location
+    |> append_script ["./scripts/ci/merge_coverage.sh"]
     |> add_artifacts
          ~expire_in
          ~name:"coverage-files-$CI_JOB_ID"
          ~when_:On_success
-         ["$BISECT_FILE"]
+         (* Store merged .coverage files or [.corrupt.json] files. *)
+         ["$BISECT_FILE/$CI_JOB_NAME_SLUG.*"]
   in
   (* Stages *)
   let trigger_stage, make_dependencies =
@@ -1060,13 +1061,9 @@ let jobs pipeline_type =
         make_rules ~changes:changeset_octez ~dependent:true ()
       in
       let job_unit_test ~__POS__ ?(image = Images.runtime_build_dependencies)
-          ?timeout ?parallel_vector ~arch ~name ?(enable_coverage = true)
-          ~make_targets () : tezos_job =
+          ?timeout ?parallel_vector ~arch ~name ~make_targets () : tezos_job =
         let arch_string = arch_to_string arch in
-        let script =
-          ["make $MAKE_TARGETS"]
-          @ if enable_coverage then ["./scripts/ci/merge_coverage.sh"] else []
-        in
+        let script = ["make $MAKE_TARGETS"] in
         let dependencies = build_dependencies arch in
         let variables =
           [
@@ -1087,34 +1084,27 @@ let jobs pipeline_type =
                 Some (Vector n) )
           | None -> (variables, None)
         in
-        let job =
-          job
-            ?timeout
-            ?parallel
-            ~__POS__
-            ~retry:2
-            ~name
-            ~stage:Stages.test
-            ~image
-            ~arch
-            ~dependencies
-            ~rules
-            ~variables
-            ~artifacts:
-              (artifacts
-                 ~name:"$CI_JOB_NAME-$CI_COMMIT_SHA-${ARCH}"
-                 ["test_results"]
-                 ~reports:(reports ~junit:"test_results/*.xml" ())
-                 ~expire_in:(Duration (Days 1))
-                 ~when_:Always)
-            ~before_script:
-              (before_script ~source_version:true ~eval_opam:true [])
-            script
-        in
-        if enable_coverage then
-          job |> enable_coverage_instrumentation
-          |> enable_coverage_output_artifact
-        else job
+        job
+          ?timeout
+          ?parallel
+          ~__POS__
+          ~retry:2
+          ~name
+          ~stage:Stages.test
+          ~image
+          ~arch
+          ~dependencies
+          ~rules
+          ~variables
+          ~artifacts:
+            (artifacts
+               ~name:"$CI_JOB_NAME-$CI_COMMIT_SHA-${ARCH}"
+               ["test_results"]
+               ~reports:(reports ~junit:"test_results/*.xml" ())
+               ~expire_in:(Duration (Days 1))
+               ~when_:Always)
+          ~before_script:(before_script ~source_version:true ~eval_opam:true [])
+          script
       in
       let oc_unit_non_proto_x86_64 =
         job_unit_test
@@ -1124,6 +1114,7 @@ let jobs pipeline_type =
           ~image:Images.runtime_build_test_dependencies
           ~make_targets:["test-nonproto-unit"]
           ()
+        |> enable_coverage_instrumentation |> enable_coverage_output_artifact
       in
       let oc_unit_other_x86_64 =
         (* Runs unit tests for contrib. *)
@@ -1133,6 +1124,7 @@ let jobs pipeline_type =
           ~arch:Amd64
           ~make_targets:["test-other-unit"]
           ()
+        |> enable_coverage_instrumentation |> enable_coverage_output_artifact
       in
       let oc_unit_proto_x86_64 =
         (* Runs unit tests for protocol. *)
@@ -1142,8 +1134,11 @@ let jobs pipeline_type =
           ~arch:Amd64
           ~make_targets:["test-proto-unit"]
           ()
+        |> enable_coverage_instrumentation |> enable_coverage_output_artifact
       in
       let oc_unit_non_proto_arm64 =
+        (* No coverage for arm64 jobs -- the code they test is a
+           subset of that tested by x86_64 unit tests. *)
         job_unit_test
           ~__POS__
           ~name:"oc.unit:non-proto-arm64"
@@ -1151,9 +1146,6 @@ let jobs pipeline_type =
           ~arch:Arm64 (* The [lib_benchmark] unit tests require Python *)
           ~image:Images.runtime_build_test_dependencies
           ~make_targets:["test-nonproto-unit"; "test-webassembly"]
-            (* No coverage for arm64 jobs -- the code they test is a
-               subset of that tested by x86_64 unit tests. *)
-          ~enable_coverage:false
           ()
       in
       let oc_unit_webassembly_x86_64 =
diff --git a/ci/bin/tezos_ci.ml b/ci/bin/tezos_ci.ml
index 5e018f0f6498e9ed20662b32f3e79726035d5c29..526b4eb0e41d1af292490e09276d14b0308f7093 100644
--- a/ci/bin/tezos_ci.ml
+++ b/ci/bin/tezos_ci.ml
@@ -622,3 +622,6 @@ let check_files ~remove_extra_files ?(exclude = fun _ -> false) () =
         \  rm %s"
         (error_not_generated |> String_set.elements |> String.concat " ")) ;
   if !Cli.has_error then exit 1
+
+let append_script script tezos_job =
+  map_job tezos_job @@ fun job -> {job with script = job.script @ script}
diff --git a/ci/bin/tezos_ci.mli b/ci/bin/tezos_ci.mli
index bee791753ca33574b57fe03e220485f81f1f1900..d5ee82187d2574f2ed70ce48a9096535521b6e62 100644
--- a/ci/bin/tezos_ci.mli
+++ b/ci/bin/tezos_ci.mli
@@ -291,3 +291,6 @@ val add_artifacts :
     [job], unless [allow_overwrite] is true (default is [false]). *)
 val append_variables :
   ?allow_overwrite:bool -> Gitlab_ci.Types.variables -> tezos_job -> tezos_job
+
+(** Append to the [script:] section of a job. *)
+val append_script : string list -> tezos_job -> tezos_job
diff --git a/scripts/ci/download_coverage/download.ml b/scripts/ci/download_coverage/download.ml
index 30658f6dda0da9641f5e272ea849d8ca1690c23d..588b16cfe2f8a2c2e09aa1e98a1c8b9765d8df79 100644
--- a/scripts/ci/download_coverage/download.ml
+++ b/scripts/ci/download_coverage/download.ml
@@ -66,11 +66,24 @@ let fetch_pipeline_coverage_from_jobs pipeline =
     let job_id = JSON.(job |-> "id" |> as_int) in
     let job_name = JSON.(job |-> "name" |> as_string) in
     let job_status = JSON.(job |-> "status" |> as_string) in
+    (* Based on [Utils.slugify] from
+       https://gitlab.com/gitlab-org/gitlab/blob/master/gems/gitlab-utils/lib/gitlab/utils.rb#L58 *)
+    let slugify str =
+      let str =
+        String.map
+          (function
+            | ('a' .. 'z' | 'A' .. 'Z' | '0' .. '9') as c -> c | _ -> '-')
+          str
+      in
+      let str = String.sub str 0 (min (String.length job_name) 63) in
+      Base.replace_string (rex "^-+|-+$") ~by:"" str
+    in
     let artifact_name =
-      Base.replace_string (rex "[\\\\/_ @\\[\\]]+") job_name ~by:"-"
-      ^ ".coverage"
-      (* See for [scripts/ci/merge_coverage.sh] for details on how
-         job_names are mangled into coverage trace artifact paths. *)
+      (* Coverage traces are stored in [${CI_JOB_NAME_SLUG}.coverage]
+         (see [scripts/ci/merge_coverage.sh]) for full details,
+         and see https://docs.gitlab.com/ee/ci/variables/predefined_variables.html
+         for the details on CI_JOB_NAME_SLUG. *)
+      slugify job_name ^ ".coverage"
     in
     let artifact_path = coverage_traces_directory // artifact_name in
     if
diff --git a/scripts/ci/merge_coverage.sh b/scripts/ci/merge_coverage.sh
index 589cc779f98026cc6417f31eea04ae5351b51924..2ecf7fa3a04f814c7e0c2d25886439d2db45da8c 100755
--- a/scripts/ci/merge_coverage.sh
+++ b/scripts/ci/merge_coverage.sh
@@ -2,29 +2,27 @@
 
 set -eu
 
-# Pass [-s] to [tr] to squeeze repeat (use short option) for BusyBox
-# compatibility.
-COVERAGE_MERGED=$(echo "$CI_JOB_NAME" | tr -s '[\/_ @[]+' '-')
+coverage_merged="$CI_JOB_NAME_SLUG".coverage
 
 # If BISECT_FILE is not set, or the ci--no-coverage label is set, we
 # do not attempt to merge the coverage files
 if [ -z "${BISECT_FILE:-}" ] || echo "${CI_MERGE_REQUEST_LABELS:-}" | grep -q '\(^\|,\)ci--no-coverage\($\|,\)'; then
-  rm -f "$BISECT_FILE"*.coverage
+  if [ -n "${BISECT_FILE:-}" ]; then
+    rm -f "$BISECT_FILE"*.coverage
+  fi
   echo "Coverage is disabled."
-elif bisect-ppx-report merge --coverage-path "$BISECT_FILE" "$COVERAGE_MERGED".coverage; then
+elif bisect-ppx-report merge --coverage-path "$BISECT_FILE" "$coverage_merged"; then
   # Merge was successful, meaning that no corrupted files were found
-  COVERAGE_MERGED="$COVERAGE_MERGED".coverage
   rm -f "$BISECT_FILE"*.coverage
-  mv "$COVERAGE_MERGED" "$BISECT_FILE"
-  echo "Merged coverage files to ${BISECT_FILE}/${COVERAGE_MERGED}"
+  mv "$coverage_merged" "$BISECT_FILE"
+  echo "Merged coverage files to ${BISECT_FILE}${coverage_merged}"
 else
   # Merge was not successful, meaning that coverage was corrupted.
   # Store failure details as an artifact that is treated in the job
   # `unified_coverage`.
   rm -f "$BISECT_FILE"*.coverage
-  COVERAGE_MERGED="$COVERAGE_MERGED".corrupt.json
+  coverage_corrupt="${BISECT_FILE}${CI_JOB_NAME_SLUG}".corrupt.json
   printf '{"job_id": %s, "job_name": "%s", "job_web_url": "%s"}' \
-    "$CI_JOB_ID" "$CI_JOB_NAME" "$CI_JOB_URL" > "$COVERAGE_MERGED"
-  mv "$COVERAGE_MERGED" "$BISECT_FILE"
-  echo "Corrupt coverage files detected, wrote ${BISECT_FILE}${COVERAGE_MERGED}"
+    "$CI_JOB_ID" "$CI_JOB_NAME" "$CI_JOB_URL" > "$coverage_corrupt"
+  echo "Corrupt coverage files detected, wrote ${coverage_corrupt}"
 fi