[wp-trac] [WordPress Trac] #52472: Leave site prompt occurring after changes saved

[WordPress Trac]

#52472: Leave site prompt occurring after changes saved
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 Reporter:  halibutblue   |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  5.6.1
 Severity:  normal        |   Keywords:
  Focuses:                |
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 After updating to WP 5.6.1, my site started prompting me about leaving
 pages without saving, even though any changes I had made had been saved.

 What's happening: When I open, edit and save a page then try to leave the
 page I am prompted by a pop up that says changes have not been saved. This
 pop up also occurs when I only enter a page, do nothing, then try to
 leave.

 Expectation: to be able to open, edit and save changes to a page, or any
 section of the site and move out of it to another section without being
 prompted.

 Actions I took so far:
 - I turned off all plugins for a conflict test & the issue persists.
 - checked/upgraded PHP to 7.3.27
 - I checked the error log
 - Made sure the theme was current and notified the developer in case
 something can be done on their end.
 - Looked in forums for the issue. Noticed it had previously been occurring
 in woocommerce. Our site doesn't use woocommerce. Also noticed people
 saying classic editor might be a problem. I disabled the classic editor
 plugin & it had no effect (this was also covered in the plugin conflict
 test above).
 - I downgraded the WP version using a plugin. Taking the WP version back
 to 5.6 removed the issue. When allowed to update back to 5.6.1, the issue
 occurs again.

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Ticket URL: <https://core.trac.wordpress.org/ticket/52472>
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