Summary:
When a Partial Block is placed over top of a Dirt Path Block, it converts the Path Block to a dirt block.

List of Blocks that incorrectly converts Dirt Path Blocks to Dirt:

• Top Slabs
• Trapdoors
• Hoppers
• Bells
• Buttons
• Lightning Rods
• End Rods
• Standing Banners
• Coral (Dead & Alive)
• Side Mounted Grind Stones/Bottom Grind Stones
• Chains
• Signs
• Laterns
• Pointed Dripstone

Steps to reproduce:

1. Place Dirt Path.
2. Place the blocks shown above so that they do not touch the Dirt Path.

Observed results:
Dirt Path converts to dirt.

Expected results:
Dirt Path does not convert to dirt.