FSE post-content block is using wrong "first" item in the query loop

[Trekky]

Hey,

I've created a block based theme for a Full-Site-Editing experience and noticed the following problem:

I would like to show only posts from a specific category on the frontpage and created a template with the following content (simplified):

<!-- wp:template-part {"slug":"header","tagName":"header","className":"site-header"} /-->
test
<!-- wp:group {"tagName":"main","layout":{"inherit":true}} -->
<main class="wp-block-group">
	<!-- wp:query {"queryId":0,"query":{"perPage":10,"pages":0,"offset":0,"postType":"post","categoryIds":[7],"tagIds":[],"order":"desc","orderBy":"date","search":"","exclude":[],"sticky":"","inherit":false}} -->
	<div class="wp-block-query">
		<!-- wp:post-template -->
			<!-- wp:post-title {"isLink":true} /-->
			<!-- wp:post-content /-->
		<!-- /wp:post-template -->
	<!-- /wp:query -->
</main>
<!-- /wp:group -->
<!-- wp:template-part {"slug":"footer","tagName":"footer","className":"site-footer"} /-->

When using the block "post-content" the wrong post content is shown. When using post-excerpt the correct excerpt is used.
Apparently the problem lies in the post-content.php file (​https://github.com/WordPress/WordPress/blob/aeb3b7530af57db885dfa8f377a7c6aa22e309bd/wp-includes/blocks/post-content.php#L42) where

the_post() 

is called.
When this call is removed everything is working as expected. It seems this workaround for "third-party plugins" doesn't handle all edge cases.
In this case the latest post on the whole site is saved as the_post() instead of the latest post of the query.

I hope someone gets a solution for the problem.

Thank you very much!