[wp-trac] [WordPress Trac] #57521: Appearance -» Customize not working after update 5.8

[WordPress Trac]

#57521: Appearance -» Customize not working after update 5.8
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 Reporter:  va2m          |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Customize     |    Version:
 Severity:  major         |   Keywords:
  Focuses:                |
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 The appearance -» customize is not working after wordpress update to
 version 5.8 and above.

 The only thing that appears in the info is "your are customising" but the
 menu and submenus doesn’t appear or load. I tried to uninstalled all
 plugins, used the default themes (Twenty Twenty 2.1 and Twenty Twenty-One
 1.7) but it still doesn’t work.

 I tried on versions 5.8, 5.9, 6.0 and 6.1. Only in version 5.7 it working
 normally!

 In the server is installed PHP version 7.4.

 Thanks for the help!

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Ticket URL: <https://core.trac.wordpress.org/ticket/57521>
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