I would really like to know if you can and gonna do something to change this.
yes. So if is true that they respawned all time in dion because ur clan killed them outside casttle zone thats not a bug just a mistake of yours not bug i think.
About teleport to Dion yes i think should be bloqued , and i remember on 2011 , and on some tests it get bloqued during sieges
need determine cause of this or ask smeli if he changed maybe.