Yup. I have seen this a bunch of times myself. It has happened in all chapters. What is funny, is that it is usually (for me) La'zel, who has a longer jump than the rest of my party. I had one instance at the end of chapter 2 upon returning from camp, Astarian "spawned" on the second floor of a building and couldn't figure out how to get down to where the main party was. I didn't realize it until I got into combat some ways away. and it happened several times in 'places where the jumping is extended'.
Regarding solutions, the problem appears to be pathing. As in the problem isn't that they can't jump the gap (or otherwise keep up with the party leader), but that the pathing fails at a certain point (usually related to jumping). My suggestion, when the pathing routine fails, have it attempt to fire again after a short interval or once the rest of the party has moved. The program is smart enough to actually unchain the impacted character, so maybe before it does that, have it try one final time.
