Description
When pressing Delete at the very edge of a List block, if the selected list item is nested, then there will be no merging with the following Paragraph block.
Step-by-step reproduction instructions
- Start new post
- Add a list block with one outer-level item and one nested item
- Add a paragraph block with some text after the list
- Place the cursor at the end of the nested item
- Press Delete
Expected: The paragraph should merge into the list as a new nested item
Observed: Nothing happens
The correct behaviour is observed if the list is not nested.
Sample post content
<!-- wp:list -->
<ul class="wp-block-list"><!-- wp:list-item -->
<li>outer [place cursor here and press Delete]</li>
<!-- /wp:list-item --></ul>
<!-- /wp:list -->
<!-- wp:paragraph -->
<p>text <mark style="background-color:rgba(0, 0, 0, 0);color:#028c00" class="has-inline-color">[will correctly merge into list]</mark></p>
<!-- /wp:paragraph -->
<!-- wp:separator -->
<hr class="wp-block-separator has-alpha-channel-opacity"/>
<!-- /wp:separator -->
<!-- wp:list -->
<ul class="wp-block-list"><!-- wp:list-item -->
<li>outer<!-- wp:list -->
<ul class="wp-block-list"><!-- wp:list-item -->
<li>inner [place cursor here and press Delete]</li>
<!-- /wp:list-item --></ul>
<!-- /wp:list --></li>
<!-- /wp:list-item --></ul>
<!-- /wp:list -->
<!-- wp:paragraph -->
<p>text <mark style="background-color:rgba(0, 0, 0, 0);color:#a30000" class="has-inline-color">[will not respond]</mark></p>
<!-- /wp:paragraph -->
Screenshots, screen recording, code snippet

Environment info
Please confirm that you have searched existing issues in the repo.
Please confirm that you have tested with all plugins deactivated except Gutenberg.
Please confirm which theme type you used for testing.
Description
When pressing Delete at the very edge of a List block, if the selected list item is nested, then there will be no merging with the following Paragraph block.
Step-by-step reproduction instructions
Expected: The paragraph should merge into the list as a new nested item
Observed: Nothing happens
The correct behaviour is observed if the list is not nested.
Sample post content
Screenshots, screen recording, code snippet
Environment info
Please confirm that you have searched existing issues in the repo.
Please confirm that you have tested with all plugins deactivated except Gutenberg.
Please confirm which theme type you used for testing.