So when change with NBTExplorer the Player NBT rotation and position to NaN the game crashes when you open up the world!!
I think that it need to turn that back into 0 or another number!!
Bonus Bug:
When you reach Y-30000000 the game kicks out of the world!!
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Modifying the world data with 3rd party tools is not supported. If you can reproduce this in-game, please open a new report.