Falling blocks fail to collide with a player sneaking on a block edge

Short description of the issue:
When a player is sneaking (holding Shift) on the absolute edge of a block, gravity-affected blocks like Sand or Gravel that fall directly into the player's extended hitbox space fail to detect the collision.

Steps to reproduce the issue:

1. Build a high pillar and stand on top of it.

2. Sneak (hold Shift) and move to the absolute edge of the block so your character model is partially leaning over the empty air.

3. Drop a gravity block (such as Sand or Gravel) from directly above the empty space where your extended hitbox is leaning.

4. Observe the falling block's behavior.

Expected result:
The falling block should collide with the player, either pushing them off the edge, landing on top of them, or causing suffocation damage.

Actual result:
The falling block completely misses the collision check. It passes through or falls right past the player's extended hitbox without causing any damage, leaving the player safely standing on the edge.