Falling blocks still convert to a block on a boat when there is a non-solid block underneath

The bug

When a falling block lands on top of a boat, it might get placed on top of a non-solid block, such as a torch.

How to reproduce

1. Place a boat on top of a solid block
2. Place a torch on the side of that block
3. Make sure the boat's hitbox (visible using F3+B) extends over the solid block on the side the torch is placed on
4. Place sand at least two blocks above the torch
   → The sand will fall, land on the boat, and get placed on top of the torch