The bug
When you had an ArmorStand as passenger on a boat, drove a little bit with it, and then exit the boat, for the client the boat often starts rotating.
How to reproduce
Use the following command, on a one block wide tower
Example command
/summon Boat ~ ~1 ~ {Passengers:[{id:"ArmorStand"}]}
Enter the boat and drive a little bit
Exit the boat
The boat might spin on its own now
Related issues
Attachments
Comments

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Is this still an issue in the most recent versions (i.e. 1.10.2, or 16w42a) of Minecraft?