[Bug] Mounts hopping around as if on crack

[Flavescent]

As of 0.0.34, if the player is mounted and cannot fly, and tries to navigate to a point with vnavmesh (/vnavmesh moveto, /vnavmesh moveflag), the following bug occurs:

The mount will hop aggressively every few yalms, as if trying to take off.

This bug occurs both in zones where flying has not yet been unlocked, and in zones where flying is disabled (e.g., Idyllshire).