Cannot read properties of undefined (reading 'attach') on D10.4.x

Problem/Motivation

When I upgrade from Drupal 10.3.10 to D10.4.x, the formatted edition text boxes for ACE or even CKEditor no longer work.

I get the following error in the js console:

drupal.js?v=10.4.1:64 Uncaught TypeError: Cannot read properties of undefined (reading 'attach')
    at Drupal.editorAttach (editor.js?v=10.4.1:304:37)
    at editor.js?v=10.4.1:228:18
    at Array.forEach (<anonymous>)
    at Object.attach (editor.js?v=10.4.1:211:52)
    at drupal.js?v=10.4.1:166:24
    at Array.forEach (<anonymous>)
    at Drupal.attachBehaviors (drupal.js?v=10.4.1:162:34)
    at big_pipe.js?v=10.4.1:153:10
    at big_pipe.js?v=10.4.1:184:3

If I go back to 10.3.10 or delete the ACE module, editable zone formatting works again.

Steps to reproduce

• Install the ACE module and Drupal 10.4.1.
• It should also have the test format configured to use ACE in “/admin/config/content/formats”.
• and try to modify an Article node, for example.

Proposed resolution

Remaining tasks

• ✅ File an issue
• ➖ Addition/Change/Update/Fix
• ➖ Testing to ensure no regression
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• ➖ UX/UI designer responsibilities
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• ➖ Documentation
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• ➖ Review with the product owner
• ➖ Release notes snippet
• ❌ Release

API changes

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Data model changes

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Release notes snippet

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