Anvil rotates when falling through torches

Put the summary of the bug you're having here

What I expected to happen was...:
the anvil to fall with a correct animation when falling trough tourch.

What actually happened was...:
sides of top of anvil dissapered when falling trough tourch but reappered when landed/stoped falling trough tourches. (I later found out it did a 90 degree turn while falling trough the tourches.)

Steps to Reproduce:
1. make a wall out sand stone (thats what i had.)
2. put tourches in a vertical line with 2 non-tourched blockes at top
3. put anvil at top of wall on side with tourches so it will fall trough the tourches.
4. observe.