I was fighting the Ender Dragon on a snapshot server and when I killed it. It didn't drop any XP.

Was it the first time the dragon died in this world?

Yes

You cant kill the ender dragon anymore. When she is sitting on the pedestal, the arrows bounce off of her. Now im stuck in the end

Well you cant kill her with a bow when she is sitting, only sword

Is this still an issue on 15w44b? If so, please update the list of affected versions.

Ticket resolved as incomplete, because no answer in a reasonable amount of time (1+ year), if it still happens, please update the ticket.