[wp-trac] [WordPress Trac] #53761: Widgets Panel powered by Block Editor completely broken

[WordPress Trac]

#53761: Widgets Panel powered by Block Editor completely broken
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 Reporter:  GDragoN            |       Owner:  (none)
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:  Awaiting Review
Component:  Widgets            |     Version:  5.8
 Severity:  critical           |  Resolution:
 Keywords:  reporter-feedback  |     Focuses:  javascript, rest-api
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Comment (by GDragoN):

 I am not sure what was the first error. It took me few minutes to realize
 that widgets are not saving at all, and after opening the console, there
 were errors from my screenshot. Also, one of the errors repeats anytime I
 type, each keypress generates another error. And, I tried with and without
 browser cache, and with and without ScriptDebug and WP_Debug. I tested
 with the various themes, including all default Twenty*, it has no effect.
 Enabling plugins does nothing, it is broken with or without plugins.

 So far, I have upgraded 15 of my development website (local), and 3 are
 broken in the same way. I really can't explain what could be the reason
 for some to be broken, and the rest are fine.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53761#comment:6>
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