This seems to be somewhat related to MC-76184, but not entirely the same. If you have a floating Armor Stand (or any other mob) with a Zombie (or any other mob) passenger, the Zombie's rotation acts extremely strangely.
Here is a video demonstrating the bug.
I should note that guardians and spiders function logically; they do correctly update their rotation even while floating/riding an Armor Stand (or other mob). When riding boats, zombies (mobs that aren't Guardians) also update their rotation semi-correctly if the boat is on the ground. If the boat is grounded, the zombie updates its rotation in jerked motions, even though the model appears to follow the villager smoothly. When the boat is airborne, the Zombie's rotation functions as it does in the video, and the model does not even appear to follow the villager.
The pitch appears to be updating correctly; only the yaw seems to be bugged.
Related issues
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migrated
migrated
Yes, it still affects 1.11 (and the current snapshot).
wobst.michael
Is this still an issue in the most recent versions (currently that is 1.12.2, or the latest 1.13 development snapshot 18w07c) of Minecraft?
Uriel Salischiker
Is this still a issue in the latest version of the game(currently 1.13.1)?
If so, please add it to the affected versions, thanks!
migrated
Confirmed in 20w21a
galaxy_2alex
If you can still reproduce it in 1.16.1 or 20w29a, please provide exact reproduction steps including commands used.
Does this problem still affect Minecraft 1.11?