Health bar of some mobs disappears

Health bar of mobs that a player can ride disappears.

1. Spawn a donkey and tame it.
2. Ride on the donkey.
3. You can't see the health bar of the donkey.

Here are screenshots comparison of Beta 1.20.60.22 and Beta 1.20.60.23. This bug begins in Beta 1.20.60.23.

The expected result is that player can view the health bar of donkey.