This is my last more and I have been farming stems for weeks on and off trying to unlock this. I am still getting multiple nodes. I have decrypted in orbit and on mars. I have done so on multiple characters. I have opened all nodes that I already have credit for to account for Bungie's "checklist". I am going to be incredibly frustrated if I can't get credit before vaulting. I'd guess I've opened near 100 nodes since the supposed dupe protection went live. I've seen many many dupes and not even seen all the other nodes I have. Not sure what's wrong.