[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 ixkaito):

 This bug still exists with the `after_setup_theme` hook.

 And I found that if you change the state of the widget, the error
 disappears.

 [[Image(https://core.trac.wordpress.org/raw-
 attachment/ticket/53479/2021-06-23%20at%2018.29.07.gif)]]

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Ticket URL: <https://core.trac.wordpress.org/ticket/53479#comment:5>
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