Attempting flatcore any% (get 15 'eye of ender's), died on 1st attempt and deleted world, world was not deleted htere so I had to delet from world selection screen and instead the frame on which I died replaced the background for world creation gui, and I can still hear the slimes on the title screen as well.
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I also noticed that when I run the title screen and go back to the world creation page, the slimes have moved, the world is still somehow being simulated even though the world is deleted and I'm dead, the slimes ignore me.

I can also take screenshots as if I'm in game through the world selection screen, this bug is crazy.

Options screen also affected, MC thinks I'm in game but keyboard commands that have another function on the page I'm on don't work, thats why I can screenshot but can't move.
This is really weird. I tested it, also happens to me. But someone else already reported it: MC-30646. I updated that report to include the latest version 1.11.2.