Coarse dirt and grass block can't be tilled under torches, buttons, levers, or other non-full blocks

The bug

Coarse dirt and grass block can't be tilled if buttons, torches, and other non-full blocks are placed above it. Even if these non-full blocks are placed on the sides of blocks above the dirt.

Expected Result

You would be able to till coarse dirt and grass blocks when non-full blocks are placed above them.

Code analysis

Code analysis by [Mod] Avoma provided in this comment.