Temperature bug in custom biomes

There’s a bug with the new partial biome replacement feature: when using low temperatures, for example:

"minecraft:climate": {

"downfall": 0.5,

"snow_accumulation": [ 0.125, 0.5 ],

"temperature": -0.2

}

any leaves turn red. This doesn’t happen in vanilla cold biomes like Ice Plains, Ice Mountains, etc., where low temperatures don’t cause that color change.