Does the Query Loop only accept patterns that are pre-registered in a plugin/theme?

[brutal-orange]

I have created the following pattern:

<!-- wp:group {"layout":{"type":"constrained"}} -->
<div class="wp-block-group"><!-- wp:columns -->
<div class="wp-block-columns"><!-- wp:column -->
<div class="wp-block-column"><!-- wp:group {"layout":{"type":"flex","orientation":"vertical","justifyContent":"center"}} -->
<div class="wp-block-group"><!-- wp:post-featured-image {"width":"100%","height":"480px","scale":"contain"} /-->

<!-- wp:post-title /-->

<!-- wp:post-date /--></div>
<!-- /wp:group --></div>
<!-- /wp:column -->

<!-- wp:column -->
<div class="wp-block-column"><!-- wp:group {"layout":{"type":"flex","orientation":"vertical","justifyContent":"center"}} -->
<div class="wp-block-group"><!-- wp:post-featured-image {"width":"100%","height":"480px","scale":"contain"} /-->

<!-- wp:post-title /-->

<!-- wp:post-date /--></div>
<!-- /wp:group --></div>
<!-- /wp:column -->

<!-- wp:column -->
<div class="wp-block-column"><!-- wp:group {"layout":{"type":"flex","orientation":"vertical","justifyContent":"center"}} -->
<div class="wp-block-group"><!-- wp:post-featured-image {"width":"100%","height":"480px","scale":"contain"} /-->

<!-- wp:post-title /-->

<!-- wp:post-date /--></div>
<!-- /wp:group --></div>
<!-- /wp:column --></div>
<!-- /wp:columns --></div>
<!-- /wp:group -->

that I would like to use as a child of the core/query block. I saved this under "My Patterns", but when I insert a core/query block, and then I open the Patterns Library, it's not there. I tried saving it with all the relevant tags (posts, post, core/query, query), but the only way for it to be seen is if I use register_block_pattern.

What gives?