Affects Version/s: 21w17a
Fix Version/s: None
The C&C Preview Datapack can sometimes create biomes with the ID "minecraft:null" or turn biomes that aren't oceans into "minecraft:ocean" biomes. The corruption creates intense lag while crossing the chunk borders.
How to recreate:
1- Create a world with the C&C Preview datapack.
2- Go around and load chunks, may be random but this happened to me the most when I had ocean biomes loaded
3- Biomes with wrong ID's will generate and the corrupted ID's will spread to already loaded biomes.
4- Once the corrupted biomes are unloaded the bug stops and world generates as intended.