Doesn’t Seem to Catch all Classic Editor Blocks

Hi there,

While this seems to catch SOME Classic Editor blocks, it doesn’t seem to catchy as many as I’d like. (I even tried hacking it just a tad to increase the max depth, but it didn’t seem to help.)

Here is a basic example of post markup that I’d expect this plugin to “Convert to Blocks” automatically when loading the edit post screen (unless I’m misunderstanding something).

<!-- wp:columns -->
<div class="wp-block-columns"><!-- wp:column -->
<div class="wp-block-column"><!-- wp:freeform -->
<p>I am in the left column</p>
<!-- /wp:freeform --></div>
<!-- /wp:column -->

<!-- wp:column -->
<div class="wp-block-column"><!-- wp:freeform -->
<p>And I, the right.</p>
<!-- /wp:freeform --></div>
<!-- /wp:column --></div>
<!-- /wp:columns -->

If you make a post with just this content, then activate the plugin and edit this post, it doesn’t automatically run “Convert to blocks” (and no JS errors appear).

WP 5.7.2

Any thoughts?

Thanks much!