I've had déjà vu and I'm pretty sure everyone else has too, at some point. We've all had that feeling of familiarity in a situation where reason assures you it's unique and happening for the first time, but somehow ...not. Some stranger types of déjà vu I've had are feeling familiarity of a situation as someone else in the situation. Simultaneously, it has seemed familiar to have that point of view (as though my own) and also that point of view witnessing my self from that other perspective. It's been further dissociative in my experience where I've felt familiarity as a different point of view (as previously described) except the it's from a movie or even a book. These were fictional and not like a news story or anything like that of real and/or historical events. In some ways it is that familiarity you feel in the midst of a dream, where sometimes the absurd seems perfectly ordinary and you are able to treat it all with the aplomb of regular existence. Waking from the dream, the "reality" of that dream experience melts away like the morning mist and it seems perplexing that such a thing were so readily accepted and addressed with normality.
TBH I've had that sort of reaction, as well. Internally, I will try to test this feeling of déjà vu with predictions and see if it correlates in any way. Sometimes it dispels the feeling, sometimes it doesn't. On another layer of inception, there can be a feedback loop where having the déjà vu is part of the déjà vu experience. Déjà vu of déjà vu. One possible explanation I've thought of is that it shouldn't have predictive power if it's just a feeling. When things happen it's almost "of course" (but more in hindsight) but if this déjà vu is wrapped in another déjà vu, it's unable to transcend or escape its own loop and offers no insight to the future.