I have noticed that I have a ship moving into unrevealed FOW that, if I'm not watching it, that it seems that there are areas that don't get revealed (as if it had moved a bit, jumped a bit and then moved again)
Haven't seen it a lot lately because I tend to manually control my exploration ships, but I was doing an experiment with using a black hole generator to send a fleet consisting of a stellar architect and a scout across the galaxy and noticed it when the scout came back down the hyperlane.
That has nothing to do with the new hyperlanes, that happens since GC 3 came out. It looks like when unobserved ships move by jumping to the endpoint in the current turn, revealing FOW according to sensor range there and jumping to the next endpoint next turn, revealing again FOW as far as the sensors see, etc.