Gallery gap adjustment in Gutenberg 12.9.0 does not work

[burnuser]

I tried the new gallery gap support in Gutenberg 12.9.0 on Twenty Twenty-Two (and other FSE Themes) in several test environments, including a completely new one on ​https://wpsandbox.net/

The result is every time the same:
Inserting a gallery (e.g. 6 images in 3 columns) works as regular.
But any entered value in "block spacing" converts the gallery in a single column (with gaps acording to the entered value)

[glendaviesnz]

Thanks for reporting @burnuser.

I wasn't able to replicate this in a 5.9.2 install with the latest Gutenberg on TwentyTwentyTwo:

Are you able to provide a link to frontend page where the gallery is doing this?

[burnuser]

I get the same result on 3 different test-environments:

1.) local environment from Laragon
... with error-message

2.) TasteWP Sandbox (exists 24h): ​https://panoramicexchange.s2-tastewp.com/
... with same error-message:
Warning: preg_match() expects parameter 2 to be string, array given in /s2-panoramicexchange/wordpress/wp-content/plugins/gutenberg/build/block-library/blocks/gallery.php on line 51

3.) InstaWP Sandbox (exists 8h): ​https://jepocu.us4.instawp.xyz/
... without error-message

[glendaviesnz]

Thanks for the extra detail @burnuser This issue was fixed here ​https://github.com/WordPress/gutenberg/pull/39788 and this fix will be included in release 13.0