Patterns: previewing a pattern which contains a Query disables the Site Browser back button

[jordesign]

Description

When previewing patterns - previewing a category which contains patterns that use a Query within them seems to break the Site Browser's 'Back button.

Additionally - there is a lot of flashing/glitching when loading the patterns that contain queries.

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I found this to be true for categories containing the following types of patterns:

• A pattern from the theme which contained the Comments block.

comments_pattern_theme.mov

• A custom pattern which contained the Comments block.

comments_pattern_custom.mov

• A custom pattern which contained a Query Loop

patterns_query.mov

Step-by-step reproduction instructions

1. Open the Site Editor and go to the Patterns section
2. Preview a pattern category which contains a pattern using a query within it (for example 'general' in TT2).
3. Try and use the 'back' chevron to the left of the 'Patterns' title.

Screenshots, screen recording, code snippet

No response

Environment info

WP 6.3 RC2
No plugins
TT3

Please confirm that you have searched existing issues in the repo.

No

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes

[t-hamano]

I think this issue has been resolved in #52964 and a backport label has been given, but it does not appear to have been backported to the latest RC version yet. It would be a good idea to test it again in the next RC3 release.

[tellthemachines]

I can no longer reproduce this in Gutenberg trunk; closing as fixed by #52964, which will be added to 6.3 RC3.