Byzantium location

I think that I have this issue:

After researching Project Hecate, I have on the screen Byzantium, but not on locations, just Project Phoenix Objetives and I can’t click and fly to one spot to complete the mission

Same for Tomb of the Mad Scientist

can anyone help me?

Hmmm, I’m not sure if I’ve had the same situation, but certainly there is an issue. I’ve completed the Byzantium mission and it’s remained on the mission objective summary.

I completed that mission months ago, but I can’t remember what have changed

maybe another completed mission preventing Byzantium location? I don’t know mission interactions