I ended a monolith and picked every loot i could see with filter, but i like to see hidden items to check if i did well my loot filter. I pressed Z instead of X and disabled the capability of see every item in the ground. Then, i pressed Z again to enable the feature and X to see the hidden items but didnt show nothing.
Disabling the item filter i was able to see the items in the ground again, even if i enable again the filter. I checked that pressing Z and the error happened again.
I know that in 0.82 the developers will fix some error with drop or item filter, but i wasnt sure that the new that.
I saw a similar topic but 1 month ago and i dont like necromancy so i did another topic, excuse me if i did wrong.
Update: i did another monolith and this error didnt happend. Maybe, it happend in the generated instance, not in the game session.