JSON::GeneratorError: Invalid Unicode [83 52 83 73 81] at 19

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https://new-sentry.gitlab.net/organizations/gitlab/issues/482416

EncodingError: Invalid Unicode [83 52 83 73 81] at 19
  lib/gitlab/json.rb:130:in `dump'
    Oj.dump(object, opts)
  lib/gitlab/json.rb:130:in `adapter_dump'
    Oj.dump(object, opts)
  lib/gitlab/json.rb:52:in `dump'
    adapter_dump(object)
  lib/gitlab/json.rb:266:in `stringify'
    Gitlab::Json.dump(jsonified)
  app/controllers/application_controller.rb:142:in `render'
    super.tap do
...
(179 additional frame(s) were not displayed)

JSON::GeneratorError: Invalid Unicode [83 52 83 73 81] at 19
  lib/gitlab/json.rb:270:in `rescue in stringify'
    raise JSON::GeneratorError, ex
  lib/gitlab/json.rb:265:in `stringify'
    def stringify(jsonified)
  app/controllers/application_controller.rb:142:in `render'
    super.tap do
  app/controllers/projects/refs_controller.rb:64:in `block (2 levels) in logs_tree'
    render json: logs
  app/controllers/projects/refs_controller.rb:58:in `logs_tree'
    respond_to do |format|
...
(177 additional frame(s) were not displayed)

How to reproduce

https://gitlab.com/scmaps.net/starcraft_brood_war_maps_archive/-/refs/master/logs_tree/__Z__?format=json&offset=100

It's a public project, we can clone it and check what is wrong with the JSON.

How to reproduce (another option)

#385713 (comment 2284533055)