I updated my snapshot server from 20w20b to 20w21a and it resulted in server generating empty chunks in a flat world
The server also gave 3 Errors at the start which I believe were not present in the previous snapshot:[15:36:17] [main/ERROR]: Unknown biome, defaulting to plains[15:36:19]{color:#ff0000} [main/ERROR]: {color}Unknown biome, defaulting to plains[15:36:19] [main/ERROR]: No key layers in MapLike[{}]; No key structures in MapLike[{}]
a) Please check if this also occurs in online mode.
b) The errors occur for all users, see MC-184608
c) Make sure the server uses Java 8, as it is the only one currently supported - using other versions may cause issues.
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