The question in your case would be whether W or not was actually on the map immediately after the Zion reveal, or you didn't notice this until after DM. (Also you didn't mention DC--so you're not referring to that method of learning W's location, right?)
Sure might as well attach the save here and I can check it later along with the other. That said, I'm mostly interested in W not appearing on the map at all. I don't believe there are confirmations in log for learning about duplicate maps through special means like that--that's only a derelict log thing.