[wp-trac] [WordPress Trac] #54708: Improve `_set_preview` for case when autosave missing

[WordPress Trac]

#54708: Improve `_set_preview` for case when autosave missing
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 Reporter:  adamsilverstein                     |       Owner:
                                                |  adamsilverstein
     Type:  defect (bug)                        |      Status:  assigned
 Priority:  normal                              |   Milestone:  Awaiting
                                                |  Review
Component:  General                             |     Version:
 Severity:  normal                              |  Resolution:
 Keywords:  dev-feedback has-patch 2nd-opinion  |     Focuses:
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Comment (by walbo):

 [attachment:"54708.3.diff"] looks good to me.

 Can confirm the patch fixes the featured image in block based themes when
 previewing a post. Also tested in twenty twenty one to confirm there is no
 regression in non block based themes

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Ticket URL: <https://core.trac.wordpress.org/ticket/54708#comment:8>
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