Can't interact with chests containing unique items [PC]

 I can't open any chests with unique items anymore. The prompt is missing and they seem inert. I've tested to see if other chests work and yes. At least one other kind of chest works. But no luck with chests containing unique items. The chests in question are all in the crossroads and four of them are related to the heart of corruption revenant bosses (and one is under the blighted tree in the crossroads). It's weird because I finished all the related quests and bosses yet the chests are unable to open. The one in the tree was revealed after killing a certain amount of darkspawn. But it's not possible to open it.