I was trying to solo flawless Grasp until this happened. I'm not really sure what caused this it started when I used a finisher on the scorch cannon fallen and the camera was in first person. I thought it was a one time thing and nothing else happened but as I continued the boss it got progressively worse each time I used a finisher on something. By the end I couldn't see my weapons and even when holding scorch cannon, dodging, or in a finisher I was locked to first person. For some reason I couldn't stack greed anymore either so this killed the run just as I was about to win the encounter kinda funny.
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Something similar has been happening to me on the prophecy final boss, where after two damage phases, my guns become invisible, sunspots don’t heal me, and motes I collect don’t register for the buff.