List Block: deleting an empty list block at the top of a list deletes all items within it

[annezazu]

Using WP 6.4.1 with or without GB 17.0.2, when you delete an empty list block at the very top of a list with sub list items underneath, it deletes every single item in the list:

Deleting.all.list.items.mov

My expectation would be that it would just delete the top level item and then move the sub items into their own top level list item status.

[annezazu]

I can replicate this with 6.3.1 as well so removing from the 6.4 board. cc @ellatrix!