[Sunken Chest Bug [MERGED]]

So sad - 6 of 10 done on third cycle of Dive master achievement and can not interact with any of the 10 sunken chest locations. They appear as already opened, and do not have a label on the chests.

[Sunken Chest Bug [MERGED]]

After doing the daily 10 Krait at a "visible / labeled" sunken chest on first character, I opened the sunken chest. An hour later I found another key and went to open a different chest but the sunken chest in Timberline, Harathi, Lornar were not "labeled", and could not be interacted with. I swapped to my 2nd character and talked to Lion's Arch dive NPC, and was able to see a labeled chest in Bloodtide Coast. Just found another key, and can not see a "labeled" sunken chest in Harathi or Timberline - even after talking to Lions Arch NPC on character 3 or 4. I have completed the Master Diver achievement twice but something is definitely broken now. I logged completely out of game, and took character 4 to Kessex where the sunken chest was "visible and labeled" - opened it and saw Dive Master achievement status change correctly from 4 / 10 to 5 / 10. It feels like I now have to visit the sunken chests in a particular order in order to see them labeled / interactable. Sad . . .