Can't normally save and exit a Minecraft world in the most recent snapshot

When I try to save and exit a world in 20w15, the game freezes, and makes a really high pitched sound, and my gpu fans ram up to 100%. This happens when exiting from the nether but also from the overworld. The only thing that I can do to exit the game now is to kill the process in system monitor. When I reenter the world it reverted back to it's original state(I have never been able to save this world)

 

How to reproduce:

Open a Minecraft world in the latest version and try to save it.