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Flaky tests detected in 6e196e4.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/20098313607
📝 Reported issues:

• [Flaky Test] should open and edit templates correctly when active_templates experiment is disabled #73743 in /test/e2e/specs/site-editor/template-id-format.spec.js

Not sure about replacing if ( ! wp_is_block_theme() ) with if ( ! wp_theme_has_theme_json() ). This is because a theme can be considered a block theme even if it doesn't explicitly include a theme.json file, suggesting the two functions may not be entirely interchangeable for determining theme capabilities.

This is because a theme can be considered a block theme even if it doesn't explicitly include a theme.json file

That's right. What if we change the conditional statement to this:

if ( ! wp_is_block_theme() && ! wp_theme_has_theme_json() ) {
	return;
}

I also noticed that the global styles doesnn't work for themes that don't have a theme.json. I think this is because the initial data is only inserted if the theme has a theme.json.

https://github.com/WordPress/wordpress-develop/blob/63b3a8f6c874c8dd7cec0400edf3135ad98f649d/src/wp-includes/class-wp-theme-json-resolver.php#L490