java.lang.IllegalArgumentException: Name and ID cannot both be blank

Snapshot 22w18a Crash

What I expected to happen was...:
For it to load like it normally does.

What actually happened was...:
It took longer to load than usual and I got an error that brought me back to the Minecraft Launcher.

Steps to Reproduce:
1. Go to the Minecraft Launcher and hit play. (Minecraft Demo only, to my knowledge)
2. Wait for experimental world to load.
3. Once at 100%, it sends you back to the launcher and gives a crash report.

I'm positive this is only for the demo snapshot version, since I don't have Minecraft, but it's still strange nonetheless. I tested out the 1.18.2 demo and that worked fine.