The bug
Ravager can ram with their head and roar to attack the enemy behind when it's on boats, boats with chest, bamboo raft or bamboo raft with chest.
Below is the command to reproduce:
/summon oak_boat ~ ~1 ~ {Passengers:[{id:ravager}]}
Related issues
discovered while testing
relates to
Attachments
Comments


Why are you separating all these issues? It's all the same issue of the client side not allowing the mob to turn, while the server does... (the server being at fault: MC-90838)
Their models are restricted from turning, maybe fixable from the AI, limiting them to only attacking enemies 180 degrees in front of them.

Same fix for all the other mob reports you just made... Limiting the rotating in boats is absolutely a global fix, and not a per-mob issue, so why all the different reports?
The mob AI after 1.16 is unique because their AI is different.
Due to my experience with splitting MC-163255 reports, I would be inclined to create different reports for mobs of different natures.