Incompatibility with ZYCraft

[MojangPlsFix]

Expected Behavior

When generating ZYCraft Clusters the WorldDecoratingHelper should return a valid BlockState for generation

Actual Behavior

Sometimes A Nullpointer Exception is thrown, that the chunk does not exists.

Reproduction Steps

This can randomly happen.

Attachments

nikita488/ZYCraft#17 crash-2021-10-29_23.07.11-server.txt Playing on ATM 6 1.8.8