Items and mobs can sometimes bounce when dropped from a big dripleaf

Summary:

If you throw items on the big dripleaf or a mob falls on the big dripleaf, then when start falling from the big dripleaf (when big dripleaf begins to bend), the mob or item can bounce 1 time.

Steps to reproduce:

1. Place big dripleaf.

2. Throw an item at him so that the big dripleaf begins to bend over.

3. Repeat everything from step 2 if you don't notice something strange.

1. Place big dripleaf.

2. Place the block over the big dripleaf.

3. Summon a mob (who can fall) on the placed block.

4. Break the block the mob is on.

5. Repeat everything from step 2 if you don't notice something strange.

Observed results:

Items and mobs will sometimes bounce when a big dripleaf begins to bend.
This does not happen with a mob summoned directly to the big dripleaf.

Expected results:

Items and mobs should not bounce when the big dripleaf begins to bend.

Video:

Mob 

Item