[wp-trac] [WordPress Trac] #53479: Unable to add widgets after Opting out of the Widgets Block Editor in WordPress 5.8-Beta2

[WordPress Trac]

#53479: Unable to add widgets after Opting out of the Widgets Block Editor in
WordPress 5.8-Beta2
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 Reporter:  jamesros161                          |       Owner:  (none)
     Type:  defect (bug)                         |      Status:  new
 Priority:  normal                               |   Milestone:  5.8
Component:  Customize                            |     Version:  trunk
 Severity:  blocker                              |  Resolution:
 Keywords:  has-screenshots needs-testing has-   |     Focuses:
  patch has-unit-tests                           |
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Comment (by noisysocks):

 I added the fix @zieladam described plus a regression test plus some tests
 I noticed were missing. The PR fixes the issue in my testing.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53479#comment:11>
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