Description

The inline block inserter button - the one aligned to the right of an empty paragraph block, is present when the page first loads, but disappears after giving that paragraph block focus, and then removing focus.

I expect that an empty inline paragraph block always has a plus button to insert a block.

Step-by-step reproduction instructions

1. Open up the post editor
2. Notice the paragraph block has a plus icon to open the block inserter menu
3. Click on the paragraph block
4. Notice that the plus icon disappears
5. Click on the title, notice that the plus icon still doesn't appear.

Screenshots, screen recording, code snippet

Environment info

• Using GB trunk (7d4ee56) with the supplied wp-env, no other plugins activated. TT4 theme active. I checked in Firefox 131.0.2 and Chrome 130.0.6723.71
• I can also repro on the 19.5.0 release in a separate wp-env environment.

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