[wp-trac] [WordPress Trac] #52440: "Leave site? Changes you made may not be saved" on custom taxonomy pages after WP 5.6.1 update

[WordPress Trac]

#52440: "Leave site? Changes you made may not be saved" on custom taxonomy pages
after WP 5.6.1 update
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 Reporter:  archon810     |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  5.6.2
Component:  Editor        |     Version:  5.6.1
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by roger995):

 Adding my text from duplicate #52447

 "Do You Want to Leave This Site? Changes you made may not be saved" Alert
 notice on leaving updated pages (but not posts) after 5.6.1 update when
 using classic editor.

 All plugins and PHP version up to date. No change when deactivating all
 plugins and changing theme. Site health status says "good." Goes away when
 Gutenberg is turned back on. Have read forum posts, but not seeing answer.

 Code used for disabling Gutenberg:
 add_filter('use_block_editor_for_post', 'return_false', 10);

 Thanks

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Ticket URL: <https://core.trac.wordpress.org/ticket/52440#comment:7>
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