Describe the bug
If you click on a block that's sitting inside a reusable block, no options for that block will show, instead a "No block selected" message is seen in the sidebar.

To reproduce
Steps to reproduce the behavior:

1. Create a new post and add one or more blocks
2. Convert the blocks into a reusable block
3. Edit the reusable block and select one of the blocks sitting inside.
4. No settings for that block will be described, only a "No block selected" message.

Expected behavior
I would expect to be able to modify a block's settings, even if it is sitting inside a reusable block.

Screenshots

The error goes away if we edit the reusable block via the "Manage All Reusable Blocks" section:

Editor version (please complete the following information):

• WordPress 5.5.3
• Gutenberg 9.2.2

The problem seems to occur with and without the plugin.

Desktop (please complete the following information):

• Mac OS 10.13.6
• Chrome 86.0.4240.111