Its just happened to me now. First ever attempt at a Netracell, didn't even intend on completing it, just wanted to see if my build was just about good enough to survive and at least do decent damage against enemies in this level range, and I've ended up getting to the "kill enemies" stage easier than I thought I would and thought I could actually complete it. Then this goes and happens and suddenly my one weapon that can kill them isn't doing any #*!%ing damage as if the hitboxes for enemies don't exist.