This bug is probably caused due to the block's changed ID and name, and the programmer art resourcepack still uses the name grass path instead of dirt path.
MC-204902
Dirt paths are no longer compatible with the programmer art resource pack
Resolved
Fixed
14
Confirmed
Important
Textures and models
20w45a, 20w46a, 21w16a
21w20a
Retrieved
can confirm in 21w16a
related to MC-205120