Relogin on ICC creates the chance to be teleported to Deathbringer Saurfang even if Lord Marrowgar or/and Lady Deathwhisper are not dead yet!
After kill Deathbringer Saurfang there is a chance to get teleported bugged. Door is properly opened and you can continue to Festergut and Rotface but Professor Putricide door's can't be opened anymore on the save.