Spell 9454 causes movement issues

Spell 9454 causes movement issues

When applying spell 9454 (Freeze) on a normal non-gm player (while they are mounted and moving) I can sometimes see they continue on moving.

The freeze spell applies successfully but the server does not update others clients telling them that the player has stopped moving due to being freeze'd.

I think this is something to-do with the movement bug we've been experiencing.