When "Very Damaged Anvil" falling down the anvil model swapping/changing to a new anvil model and after landing he is back to "Very Damaged Anvil" again!

What I expected to happen was...:
When "Very Damaged Anvil" falling down he supposed to stay "Very Damaged Anvil" all the way down!

What actually happened was...:
Model swapping!
The model of:"Very Damaged Anvil" was changed and was swapping to a new anvil model when falling!

Steps to Reproduce:
1.Build a tower.
2.Put "Very Damaged Anvil" on the side of the highest block of the tower.
3.See how the "Very Damaged Anvil" falling down and changing his model.
4.See how after landing the anvil changed back to "Very Damaged Anvil".