[wp-trac] [WordPress Trac] #59061: Widgets Block Editor broken after update to 6.3 on every site I update

[WordPress Trac]

#59061: Widgets Block Editor broken after update to 6.3 on every site I update
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 Reporter:  alexDx        |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Widgets       |    Version:  6.3
 Severity:  major         |   Keywords:  needs-patch
  Focuses:                |
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 I've updated about 30 sites to WordPress 6.3 (all on different themes) and
 the Widgets Block Editor is broken on all of them. We are running PHP 8.0.
 I've turned on Debug and no errors are displayed in the logs. The only
 error I'm seeing is in the browser console:

 widgets.php:2035 Uncaught SyntaxError: Unexpected identifier 'stylesheet'

 I can access the widgets by installing the Classic Editor Plugin but this
 is not ideal. What is going on here?

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Ticket URL: <https://core.trac.wordpress.org/ticket/59061>
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