[wp-trac] [WordPress Trac] #52440: Leave Site windowsappears when you save a post using the classic editor, after WP 5.6.1 update (was: "Leave site? Changes you made may not be saved" on custom taxonomy pages after WP 5.6.1 update)

[WordPress Trac]

#52440: Leave Site windowsappears when you save a post using the classic editor,
after WP 5.6.1 update
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 Reporter:  archon810                            |       Owner:
                                                 |  SergeyBiryukov
     Type:  defect (bug)                         |      Status:  closed
 Priority:  high                                 |   Milestone:  5.6.2
Component:  Editor                               |     Version:  5.6.1
 Severity:  normal                               |  Resolution:  fixed
 Keywords:  has-screenshots has-patch commit     |     Focuses:
  fixed-major                                    |
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Comment (by yacsha):

 The problem is still presented in version 5.6.3 as seen in this video
 (https://imgur.com/a/teO3WSA), which I explain below:

 1. I use the classic editor in HTML mode and edit the text of a page
 2. I add the text: "test edit", then press the Update button and the
 irritating "Leave Site?" is shown
 3. I click on Leave Site and the changes to the page are saved
 4. Again I make changes to the page, deleting the text "test edit", but
 this time I press cancel, and the Update button remains working in a
 infinite loop
 5. I refresh the browser page and verify that my changes were not saved

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Ticket URL: <https://core.trac.wordpress.org/ticket/52440#comment:57>
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