This is called "error code olive" they give you a fake error code, giving them a win, and you a loss. It's absolutely not okay. It's annoying. I went 9-1 because the last game my team had this happen.
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Exactly the same thing happened to me. We go to 8-0 without boons and then this happens. It really is a huge issue and isn't good for Bungie because it's putting people off playing. :(