You can pick block grass path and place it under blocks, when you then update the block (by placing a block next to it for example) the grass path will become dirt (intended).
The grass path would instantly be replaced by dirt, not after a block update.
Steps to reproduce:
- In creative pick block grass path.
- Place a block (for example planks)
- Place the grass path below it.
- See it doesn't change to dirt.
- Place a block besides the grass path.
- See it change to dirt.