The bug

Likely due to the fix of MC-253227, entities and other non-player message sources appear in the Social Interactions menu, allowing chat reports to be created for them. Ultimately, however, sending a chat report for one of these sources fails, because they are not players.

As in previous versions, only players would be expected to appear on the Social Interactions menu.

How to reproduce

1. Join a world, and open it to LAN
2. Spawn a creeper
3. Run the following command:

   /execute as @e[type=creeper,limit=1] run say 1.19 Release Candidate 1!

4. Open the Social Interactions menu
   The creeper is listed as an offline player