[wp-trac] [WordPress Trac] #54889: Cannot access 'Manage menus' in Navigation block toolbar when running a classic theme

[WordPress Trac]

#54889: Cannot access 'Manage menus' in Navigation block toolbar when running a
classic theme
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 Reporter:  noisysocks    |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  5.9.1
Component:  Editor        |     Version:
 Severity:  normal        |  Resolution:
 Keywords:  needs-patch   |     Focuses:
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Comment (by ironprogrammer):

 Hi, @pyrobd: I was able to reproduce with @noisysocks's [#ticket repro
 steps], as well as @costdev's [#comment:4 test report]. Note that the
 active theme needs to be "classic", or non-block.

 I've attached a video that exhibits an admin user's permissions check
 failure on `/wp-admin/edit.php?post_type=wp_navigation` when attempting to
 "Manage menus" from the block editor. I used an existing menu for brevity,
 but the same happens regardless of actions taken in the block editor,
 since the permissions are really failing on the `wp_navigation` post type
 edit screen.

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Ticket URL: <https://core.trac.wordpress.org/ticket/54889#comment:11>
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