editor-injector: uncaught type error when previewing markdown

MR: Pending

Description

1. Create a workspace.
2. Open browser developer console.
3. Open markdown file in the editor.
4. Preview the markdown file.
5. Notice the following error in the developer console

Uncaught (in promise) TypeError: Failed to execute 'createNodeIterator' on 'Document': parameter 1 is not of type 'Node'.
    at n (VM20 injected.js:17:294319)
    at VM20 injected.js:17:294716
    at Vo (VM20 injected.js:17:294736)
    at ka.ensureFillableField (VM20 injected.js:17:309840)
    at VM20 injected.js:17:312452
    at o (VM20 injected.js:17:309548)
    at Object.p [as dispatch] (VM20 injected.js:17:306886)
    at VM20 injected.js:17:348913
n @ VM20 injected.js:17
(anonymous) @ VM20 injected.js:17
Vo @ VM20 injected.js:17
ensureFillableField @ VM20 injected.js:17
(anonymous) @ VM20 injected.js:17
o @ VM20 injected.js:17
p @ VM20 injected.js:17
(anonymous) @ VM20 injected.js:17
Promise.then (async)
getFrameManagerConfiguration @ VM20 injected.js:17
Bs @ VM20 injected.js:17
yy @ VM20 injected.js:17
(anonymous) @ VM20 injected.js:17
(anonymous) @ VM20 injected.js:19
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