If you rent a mount that has another mount hitched to it, the "follower" mount will vanish without a trace.
So...you have been warned.
You can hitch a mount to another mount? *scratches his head*
Really?
Edit: Whoa, I totally missed that one. Neat.
Interesting..
If you rent them in reverse order (last to first) it won't. However we do have a fix ready to go in for this.
FWIW, this bug has been fixed by the crash this afternoon/evening.