I was solo flawless up to the final boss encounter. Got it down to about quarter HP. When I try to use deepsight to see the triangle after damage, it just doesn't give me the buff. Eventually figured out the areas and got the symbols. I kill the first hive guardian and come out, try to grab deepsight, I don't get the buff, then die to the visage timer. This was my best attempt yet so I'm VERY upset about this, FIX IT ASAP!!! Putting off any further attempts until this is fixed
same thing just happened to me, it ruined my solo flawless run. Bungie doesn't even put it as a known bug which is annoying.