During this quest there are 4 items to pick up and as you pick up each there is a small story scene played out by ghosts. If you walk away before the ghosts are done talking you will not get credit for completing the step. I restarted and replayed this quest and watching closer it appears that the step is marked completed based on the conversation and not by picking up the item.
I posted a video in another thread that captures the missed step count at the location nearest the delve boss.
PC: NA
( 1m:16s to see missed step count) https://forums.elderscrollsonline.com/en/discussion/530487/bug-quest-prisoner-of-the-past-how-to-reproduce-unkillable-draugr
I posted a video in another thread that captures the missed step count at the location nearest the delve boss.
PC: NA
( 1m:16s to see missed step count) https://forums.elderscrollsonline.com/en/discussion/530487/bug-quest-prisoner-of-the-past-how-to-reproduce-unkillable-draugr