I hope you are right. But with my tests I SPAWNED the aircraft so it is perfectly aligned with the fSX AFCAD footprint. I did not DRIVE it to the gate. Also verified your test with ZERO payload as I mentioned earlier and in that scenario the Passenger handling always ends BEFORE baggage handling completes
As I've said (quite a few times already) fact you moved, spawned, loaded, slewed or ended up in any other way in the parking, even in the dead center, doesn't matter.
What matters is the radius of the parking in relationship to the rear door position of the airplane that would result the rear train ending up outside the parking areas before it's finished.
That I was able to replicate the problem by moving the airplane, is entirely irrelevant, that was just ONE way of triggering it, but unfortunately it was the only one I managed to find, following Rob's report.
If it were positional, however, then it would be same problem with ZERO load test and it wasn't.
No, that's only proving it even more, because with Zero payload, a shorter train will have less chances to end up outside the parking radius before it's done loading, compared with the full length one.