I appreciate you posting this.
I don't know if this is the same as what you are describing or not, but your post comes as close to my own experience as anything I've seen anywhere so I'll dive in.
I have always had these places that I can 'remember' as I fall asleep, in dreams, or in some waking states and at some waking moments. They don't feel like dream places or imagined places. They feel like places I have lived or seen that I am remembering. I have always wondered why they are so consistent and why they feel so much like memories, but not only does no one seem to know, no one seems to care. It's like, "Whatever, why do you even care? Let it go." Total disinterest.
But I care, a LOT. It FEELS important. So I've come to believe that either 1) these places really exist on some other plane and I visit them in certain states of consciousness, or 2) these are past life memories, or 3) these are deep soul memories that 'map' something important to my work in this life.
I guess I feel if no one has an answer and no one sees it as important, I'm free to answer myself in a way that feels right. And that's what I've come up with.
Does any of that address your post? If not, sorry for going on and on.
Good luck!