Webform field ignoring query parameters for render caching

I think this regression was cause by #3110680: Leaked metadata error being thrown when creating a webform submission via GraphQL mutation

I think we have to track the CacheableMetadata::applyTo and use CacheableMetadata::applyTo to apply the '#cache' properties to each element.

This somewhat is happening via \Drupal\Core\Utility\Token::replace

This change could be backported to 8.x-5.x.

I am not able to replicate this issue using the attached webform in Drupal 8/9 with Webform 6.x.

Are you able to replicate this issue using the attached webform?

Can you provide the steps required to reproduce this issue? Maybe a certain cache-related module is enabled.

The attached patch is an educated guess on the solution, at the very least the patch documents the problem.

The failed tests seem unrelated to the patch.

In 6.x we are allowing anonymous webforms to be cached which is exposing this issue.

The cache tags and contexts need to be merged.

I am able to reproduce this issue via Webform 6.x using the example webform when it is added to a webform node.

The attached patch catches the lost bubble metadata which is required to fix the caching issue.

Note to self: To merge bubbleable metadata we can use or copy \Drupal\Core\Render\Renderer::mergeBubbleableMetadata.

Because the error is only occurring via 6.x, let's focus the patch on 6.x and backport it to 8.x-5.x

Attached is what I feel might be the most reliable solution.

We still need to add test coverage to \Drupal\webform\Cache\WebformBubbleableMetadata and I think we might want to create a dedicated WebformSubmissionFormCacheTest that checks the $form and $element #cache property.

We can probably copy and modify. \Drupal\Tests\Core\Cache\CacheableMetadataTest

The attached patch now has test coverage and hopefully, it can be backported to 8.x-5.x.