Bl3 location not unlocking

I am standing inside the Cistern of Slaughter and the location still says 0/1. this is one of 2 locations left for the achievement and apparently i can’t discover this. So I’m just blocked from getting the achievement forever. I’ve left and came back went to title screen, everything. What am i supposed to do like really?

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please anyone

this is known bug, and not fix yet.