The game crashed whilst ticking block entity
Error: java.lang.IllegalArgumentException: Cannot get property bqe{name=enabled, clazz=class java.lang.Boolean, values=[true, false]} as it does not exist in Block{minecraft:air}
I was copying region files from one world to another and the chunks got all glitched before the game crashed.
I'm not sure copying chunk files from one world to another is supported...