If a TG has no jumpship, but a jumpship is stationed at the jumppoint (i.e. a jump tender) they will *not* jump.
OK, that's the reason then : no jump ship in the TG, a jump tender stationned on each jump point.
Aurora can´t know, if the jump tender is still there, when the ship arrives at the jumppoint, after all.
Hmmm, if I give my TG an order like :
Standard transit through Sirius Jump Point, Standard transit through Sol Jump Point, Refuel at Tanker, Aurora will accept the order. And if I move one of the jump tenders during the travel of the TG, the related jump will fail and the event log will display a warning. It's the same case, only I do it manually here and I ask Aurora to do it programmatically with the conditional orders. Isn't it ?