[wp-trac] [WordPress Trac] #54575: Provide guidance to users seeking to preview block themes on WordPress versions below 5.9

[WordPress Trac]

#54575: Provide guidance to users seeking to preview block themes on WordPress
versions below 5.9
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 Reporter:  kjellr        |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  5.9
Component:  General       |     Version:
 Severity:  normal        |  Resolution:
 Keywords:  needs-patch   |     Focuses:
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Comment (by paaljoachim):

 Having it open in an older version of WordPress might break the theme in
 various ways. As TT2 is very closely build alongside WP 5.9.

 It would be better to have a notification in the preview saying that TT2
 only works with WP 5.9 and newer and is not compatible with older
 WordPress versions.

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Ticket URL: <https://core.trac.wordpress.org/ticket/54575#comment:8>
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