2 Seat Horse Problems

My friend recently got a tier 8 two seat horse with drift and S instant accelerate. When we go, I'll sometimes glitch under the world and de-sync. Most recently, we were on the way to kazarka from khutum and I fell through the floor at altinova. When I got off the horse, I teleported all the way back to Altinova, and missed out on 2 kazarka kills and a Dim Tree Spirit kill. So, to sum it up, the two seat horse will almost always glitch you through the floor and get you stuck in the location where you went under.