The problem appeared in 1.13.0.9, it was working fine in previous versions and release versions.

 

minecraft:biome_filter component of spawn rules is broken

 

for example mobs with the following spawn rule are spawning in a plains biome

"minecraft:biome_filter": { "any_of": [

{ "test": "has_biome_tag", "operator": "==", "value": "ice_plain" }

, { "test": "has_biome_tag", "operator": "==", "value": "ice_plains" }, { "test": "has_biome_tag", "operator": "==", "value": "ice" }, { "test": "has_biome_tag", "operator": "==", "value": "cold" } ] }

 

other mobs that should only be spawning in plains biome are no longer spawning in my plains flat world. these were all functioning as expected up until this update.

 

Thanks