Yes, but there’s a difference between mystery and confusion/convenience. R2 randomly waking up at the end to give them the map was the latter, while the origin of Snoke (as much as I dislike him) is the former.

This is an odd case where the worldbuilding of Star Wars (hyperspace travel is a precise science) conflicts with the Star Wars ethos of ‘keep it simple and mysterious’. There’s also the matter of the villain’s plan. To take a villain seriously, their plan must make some amount of sense. Right now, Kylo’s plan seems nonexistent, because after he reads her mind, what then? Will he have to go into the map room and program planets and stars from his memory of her memory? Furthermore, if he was able to know in the forest that she’d seen the map, presumably he got a glimpse of it as well. What more would he need in the interrogation?

What would be ideal would be to have the chair read her brainwaves and generate a hologram of her memories that illuminates the darkened interrogation room.