If you double click on a block that has nested blocks it brings up the Block Edit dialog with sub blocks listed. If you click on a sub block it is now editing the nested block.
Oh I see. In that case I think there is something that may be considered a bug - these sub blocks don’t appear on that list when you create them first time inside this “BlockEdit” mode. You need to exit it and enter it again for them to appear there. What you think?
Maybe? It might just be that it only reads the contents upon opening it & isn’t a dynamic dialog. Let’s see what more developer oriented people say here in a few hrs.