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MC-179893

Crash when using "optimise world"

When I try to use the "optimise world" function on a minecraft world, no matter if erased cached data is checked or if I make the backup, minecraft crashes right after "saving world" appears on screen, with the crash report attached here.

Environment

Using default jvm and jvm arguments of MacOS 10.15 (Catalina) and java 8.

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20w17a

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