[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:  high                         |   Milestone:  5.6.2
Component:  Editor                       |     Version:  5.6.1
 Severity:  normal                       |  Resolution:
 Keywords:  needs-patch has-screenshots  |     Focuses:
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Changes (by audrasjb):

 * Attachment "52440.diff" added.

 Replace empty default value with `undefined` to avoid false negative in
 `initialCompareData` comparison

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