I was trying to do Interference with a friend, and we got the the part where you have to shoot the crystals, but whenever we shot them, they said "Immune". We hopped out of the mission and launched it again, and the bug happened again.
Edit: I was able to get the mission complete after relaunching a third time.
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Happened to me a few weeks back pissed me off
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Actually this season many mobs and objects are bugged with immunity, seen it in strikes events etc...
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were all mobs in the area dead? and did you stand on the plates long enough?