Not all chests recognized as found
Found all chests in Necropolis Halls--17 large chests, 1 lost hoard chest--and can count them out on the map, but am only credited as having 15 large chests, 1 lost hoard chest. I've 100% Thedas, but...
Forum Discussion
There are something like 20 total chests in the Halls, but only 17 of them count. Check out this thread that has tips on how to find the remaining chests: https://forums.ea.com/discussions/dragon-age-the-veilguard-tech-issues-en/2-necropolis-halls-chests-issue/5008930
