I found the following quests in my last game not working:

- bring a mid night stone to the armorer (or kill the golem for the stone): the golem did not drop any midnight stone and I found no midnigth stone in the rest of the game (in other games does drop one after the other)

- Clear the spider nests: all nests cleared but quests still active

- collect two dragon eyes: there was no clue where too find those. I found one per accident in one other quest. But the second came not up for me up.

In general I would like to have an option to back up from a quest, with out cancelling the quest completely. Such a thing like visit later.