21w05b, 21w06a, 21w07a, 21w10a, 21w11a, 21w13a, 21w14a
This may be an oversight, or intentional.
It seems as if grass blocks have been left out of the #lush_plants_replaceable tag that controls which blocks moss can spread to. This seems like an oversight to me as Grass, Dirt and Flowers are all part of this tag.
- Grass Blocks
- Coarse Dirt
- Dirt Path
- Rooted Dirt