We surely have limits to prevent jetway over-extension so, in that case, the jetway would probably not even start and, it's strange it docked on the rear door.
Perhaps MSFS is not respecting those limits, so jetways would always "work", at risk of over extending.
The default jetways are very limited, with the same problems as FSX. We hope to be able to fix this entirely with GSX, in the future...
