When working through this triumph I have opened so many puzzle chests and am not getting credit. I am at 2/5 which should be higher as ive opened more puzzle chests!
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this has been bugged for a while Not all Deepsight count For me and a friend only the torches counted, for someone else only the ones in the miasma You would have to try different ones and see which ones work for you and then farm that particular one or wait for it to be fixed