(Note: This only happens Sometimes)

When i load 20w22a, i would get stuck in the loading screen and it wont take me into the main menu, i can still move my mouse around, but i can no longer press any key in my keyboard.

After a few moments, the game crashes, and i go back to the launcher, along with the crash screen.

This may have to do with 20w22a lagging for some people, but i'm not sure.

Edit: I don't think it happens anymore. Minecraft doesn't crash upon loading pre-releases.