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Cult of the Eyeless - Missing Eye bug
Call me cheeky if you must, but I turned in the cult of the eyeless quest to Gaal for the sweet 75,000 XP before ducking down into the pit to continue the quest "in the right way".
Unfortunately when I repaired the rift device, the Unseen Eye did not appear, so the door out to the Shade Lich area never opened - and if it did, I imagine the kill-spot at the end of the corridor would still terminate the party because they have the completed rod.
I managed to console Ctrl+J into the temple to have a nice epic battle with the Unseen Eye and its entire cult all at once, and the Rift Device worked fine, but presumably the correct behaviour would be for the Unseen Eye to head back down into its lair looking for you, rather than waiting upstairs with its cult.