Entities willingly take fall damage from drops which are greater than three blocks high onto partial blocks

Some entities will choose to drop off 3+ block high distances, taking fall damage from it.

Steps to Reproduce:

1. Build a 3 block tall pillar
2. Place a slab level with the lowest block (or any partial block which is <= 1 block)
3. Spawn an entity on top of the pillar with the following conditions:
   1. Is not immune to fall damage
   2. Walks, and does not fly
   3. Is not intentionally pathfinding off the pillar to a selected goal

Observed Behavior:

The entity will walk off the pillar onto the slab, and take fall damage.

Expected Result:

The entity would not walk off the pillar knowing it would take fall damage if it did, just like it chooses not to do with distances of >=4.

Screenshots/Videos:

FallPillar.mp4

Notes:

Related to MC-77732 MC-108313