This was listed as fixed in the change-log for pre-6 , but still exists
Tested in multiple superflat worlds
all created in 1.12.2
A Crash occurs every time
Game is fine with pre-4
An example of a bugged world is uploaded as bugreport.zip
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[media][media]

Are you sure? I do not crash when loading a void map in pre6.

I've now attached an affected world

The return of MC-132375?