Missing point: Azalea Tree couldn't be generated

Azalea Trees can be grown from Azaleas or Flowering Azaleas by using Bone Meal. This causes the block 1 block below (Moss Block) to turn into Rooted Dirt. However, in AllayMC, this does not function normally as it does in Vanilla. Links:https://zh.minecraft.wiki/w/%E6%9D%9C%E9%B9%83%E6%A0%91