I have also encountered this bug last night.
My invaded missions worked fine and I already completed tital basin and are in WT5. I always played with me as session owner.
Last night I joined my friend his session. At some point he talked to ortega and I got the invaded mission tutorial again. Since then all my invasions are gone from my map in my own session. So I am basically done with the game. My gear score is to low to do the raid. But I can't to weekly challenges to improve my gear score. Shame after so many hours if thas to end like this :(
UbiSoft should test games more before putting them out. I had some sort of same bug with FarCry 5 were the game didn't detect that I defeated a region bug and the final boss island did'n't unlock. This took months to patch after reaching out...


