Angry mobs, like wolves, remain in angry mode for some time if their target is killed by something else

Steps to reproduce:

1. Find an untamed wolf.
2. Wait for it to enter "angry" (red eyes) mode with a target.
3. Kill the wolf's target while the wolf's eyes are red.

Expected: Wolf returns to normal mode.

Actual: Wolf stays stuck in "angry" mode. Wolf will not accept bones and cannot be tamed.

Note: I'm not sure if this always happens or only sometimes but I've observed it twice.