[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:  needs-patch has-screenshots needs-   |     Focuses:
  testing                                        |
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Comment (by zieladam):

 The issue seems to be somewhere in the widgets handling code on the
 backend, not on the frontend. I just confirmed that the request body is
 the same in the WP trunk version after opting-out from the new screen, and
 in the previous WordPress version.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53479#comment:6>
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