It no longer snows in Windswept Hills biomes after 1.18

After 1.18 was released, it stopped snowing in windswept hills biomes where there used to be snow, and the snow started to melt. For context, these mountains were generated as "extreme hill biomes" in legacy console edition, and are different from the new 1.18 mountains. This is a bug that affecting current worlds, which is something that was said to have not supposed to happen.