Unable to find/add reusable blocks via inline + button

[xpurichan]

Description

On Gutenberg version 19.9 and older we're able to use the "+" button inline in the editor to search for and add reusable blocks. Since version 20.0 the results come up empty.

Workaround: Reusable blocks can still be added by using the "+" button at the top of the editor/toolbar and with the / command on a new line.

Screenshots:

When using the inline "+" button of the editor, we see "No results" come up when searching for an existing reusable block to add:

When using the / command to search for a reusable block we do see results.

Step-by-step reproduction instructions

1. Create a reusable block, or identify a pre-existing reusable block to use
2. In the post editor use the "+" function found within the body of the post (not at the top of the editor/toolbal) to open the block menu.
3. Search for your reusable block by name
4. The reusable block will not appear, and you'll instead see "no results" instead

Note that reusable blocks can be added by other means, including the "+" button at the top of the editor, and via the / command.

Screenshots, screen recording, code snippet

No response

Environment info

No response

Please confirm that you have searched existing issues in the repo.

• Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

• Yes

Please confirm which theme type you used for testing.

• Block
• Classic
• Hybrid (e.g. classic with theme.json)
• Not sure