[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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Changes (by hellofromTonya):

 * keywords:   => needs-patch


Comment:

 = Test Report

 Env:
 * WordPress: `trunk` (i.e. 5.9.0-beta-xxx)
 * Localhost: wp-env
 * OS: macOS
 * Theme: switch between TT1 and TT2
 * Plugins: none activated

 == Steps to Reproduce:
 1. Go to Appearance > Themes
 2. Activate Twenty Twenty-One (TT1) or older theme
 3. Scroll down to the Twenty Twenty-Two (TT2) theme
 4. Click on the "Live Preview" button

 Expected behavior: Should open the site editor

 == Test Results:

 The error notice appears:
 >The theme you are currently using is not compatible with Full Site
 Editing.

 **Can reproduce the issue.**

 == Notes:

 * Can confirm that the "Live Preview" button does link to the site editor
 http://localhost:8889/wp-admin/site-editor.php.

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Ticket URL: <https://core.trac.wordpress.org/ticket/54575#comment:2>
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