Turns out I have a jump tender issue as well. Occasionally, my TGs won't do standard transits at jump points where I have a tender stationed. The type of jump engine, rating, and ship mass all exceeded the requirements of the ships going through. This happened once with a military jump tender and it somehow resolved itself by my joining the tender to the TG.
Another jump issue has occurred when attempting to standard transit tugs and their fuel harvester stations ... again in this case, jump engine type, rating, and tender mass all exceeded each of the ships that should have made the jump. Must the jump tender exceed the mass of each tug-towed pair?