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Since I'm not able to upload a video of the glitch, I'll try my best to explain it. On final phase of the Protean encounter, it decided to teleport on top of one of the railings near one of the trees in the center, making it unable to move and shoot at us, while still being able to use it's melee ability. This also caused it to indefinitely spawn clones of itself since it never actually activated it's shield and the health of the Protean stayed the same, no matter how many bullets we put into it. This caused my team to have a complete wipe and have all of our operators go MIA. I don't know if anyone else has experienced this but this absolutely killed my drive to even bother with this encounter if this bug is random and can just outright take away one of my operators.
EDIT: I've uploaded the video of the glitch to YouTube, the link below will take you to the video.