Bug Report

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How can the crash be reproduced?

[In technical_biome_toggles on biomes.json, when trying to create a world with gravel_beach or volcanic_plains enabled set to false and World_Type set to Biomes_O'_Plenty, it crashes.]

Crash Report and Logs

[crash-2021-04-30_17.53.14-server.txt]

[crash-2021-04-30_18.03.01-server.txt]

Mod Version

[Current latest version, Biomes_O'_Plenty_1.16.5-13.1.0.458]