As of 18:00 UTC, 19.June, it is still not possible to play split screen with 2 users as 2nd user loads in as guest.
Sometimes it shows as 2guest users have joined even tho it's only one. When trying to click on guest users account info (option button an clicking on guest username in minecraft) the game locks up and no buttons work in minecraft. The only way to exit game is force cliwing game in PS5 menu.
Linked issues
duplicates 1
Comments 3
We will track this issue at MCPE-222048.
This issue should be fixed in 1.21.92. What version number is shown in the bottom right corner of the Minecraft title screen?