[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        |   Keywords:
  Focuses:                |
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 As per the changes in https://core.trac.wordpress.org/ticket/53410, If
 you're using WordPress >5.9 without the Gutenberg plugin installed, you'll
 see this message when you attempt to activate a block theme:

 [[Image(https://cldup.com/dWofSu5zN7.png)]]

 However, if you choose to "Live preview" the theme, you'll see an empty
 customizer:

 [[Image(https://cldup.com/XKwSLF1f6z.png)]]

 WordPress should show a similar message in this context as well. There's
 no reason to preview the theme if your install can't display or activate
 it.

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