Same issue here. Will add details and observations of my own. (Made with the help of a friend) The final boss encounter faces multiple issues. Experimented results are the following: >Boss does not move, shoot, or stagger. Sometimes will look around here or there. Does not appear to stagger or move from original teleported location from beginning of the boss encounter. Stasis and Missile titan supers seem to not be able to cause staggering, either. (possibly due to immunity.) >Engrams/motes spawn in the spawn boxes upon mechanic interaction as intended, but are not released from the boxes (usually). The boxes do not execute their drop animations or functions related, otherwise. - Sometimes, engrams do drop if the box spawning them continuously keeps spawning them from continuing to shoot the engram mechanic until one or more clips through the box and falls. >Not sure if this is intended or not, but the "shoot this with a scorch cannon" objects all remain open the entire time regardless of interactions. >Upon successful crystal filling, the boss does not exit it's immune state. No change. >Damage phase does not cycle in observable behavior. (No visible changes pertaining to crystal filling. Does not reset after an amount of time.) >Boss may not do anything for the most part, but the only visible reaction he seems to have is stomping occasionally when the player is in proximity. ---- Hope this helps. (I see much of this already is covered if not all of it.) ----