I’m about 90% sure the game has bugged out and has given me the check for having received the smg in its reprised form. I’ve been farming EP on all the weeks it could potentially drop and haven’t had it drop or any of the weapons for that matter. The reprised version doesn’t count towards the wayfarer collection requirement. I doubt this will be addressed before the end of the season also. It sucks that I won’t get this title due to this bug.
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You need the 1.0.1 drop from the escalation protocol boss. The one from umbral engrams is 1.0.2. They are in fact different weapons. I just completed my wayfarer title on Saturday with the SMG being the final drop. You've got to clear wave 7 of escalation protocol; the drop comes from the boss, not the chest. TLDR: It isn't bugged, the drop from the umbral engrams is technically a different weapon. Run EP.