Something probably glitched when the invader tried to kill me, but I defeated them with my glaive. After that, I couldn’t pick up motes, or bank motes, and the enemies couldn’t see me. After dying, the enemies could see me once again (the invader could see me before I died, though), and I could pick up motes, but could not bank them. I had to kill myself to let my teammates bank the remaining motes I dropped.