Have any screenshot/videos:

Yes.

Summary:

When placing dirt path & farmland between 2 blocks above and below, the dirt path won't convert into dirt.

Steps to reproduce: (for Dirt Path)

1. Place blocks at the top and bottom of a 3 block column, leaving the middle block space empty.
2. Place a dirt path block in the middle space.

Steps to reproduce: (for Farmland)

1. Go to underwater / Sea
2. Place blocks at the top and bottom of a 3 block column, leaving the middle block space empty.
3. Place a Farmland block in the middle space

Expected results:

Dirt path & Farmland block turns into dirt.

Observed results:

Dirt path & Farmland block does not convert to dirt.
Keyword for search: grass