Using thrown spear skills while mounted on rhoa, bugs out and forgets you are actually on rhoa

Using any of the following:

- Explosive spear
- Whirlwind lance
- Glacial lance

make the game forget you are mounted on the rhoa. it still moves with you as if you are on it, but using skills slows you like normal. you also start rubberbanding between places and in my case the game eventually crashed.

Edit: seems to be that the issue lies in using 2 weapon sets, even if both have the rhoa enabled, switching weapons causes you to unmount the rhoa. even tho it still moves as if you were on it.