The bug consists of me logging in to my priest and appearing wherever I was logged out at suddenly on a Wyvern and no clipping through terrain and buildings. The Wyvern flies in a straight line ignoring any logical path and flies through everything in its way for a few minutes. After some time it will usually fly backwards through more terrain before either returning me to the flight master of the area I was in when I logged out OR disappearing as my character falls through the ground before appearing in the graveyard of the area I logged out in originally.
This happened to me three times today and I have screenshots of it.

