Hiya. As I have experianced a couple of times, me and my friends have been going through Thunderstorm Forest, and every time we go to the Mid-Point, we try and continue, but then get split up and then only the leader gets to continue, and the other members have to giveup. I heard it’s the same glitch as Crystal Ruins Mid-Point.
Fairly certain they are the same glitch and I have experienced them as well.