Grindstone in hand and on armor stand has z-fighting

Summary:
Grindstone in hand and on armor stand has z-fighting.

Steps to reproduce:

1. Take the Grindstone into your hand.
2. Look at it from a third person.

1.  Place an armor stand.
2.  Give the Grindstone to the armor stand.
3.  Look at Grindstone.

Observed results:
Grindstone in hand and on armor stand has z-fighting.

Expected results:
Grindstone will not have z-fighting.

Screenshots: