If the cargo loader doesn't leave is NOT a problem. Is it supposed to remain there, in order to be sure it won't interfere with the catering approach path, which might happen if it returned back to its starting point as soon the deboarding is finished.
So, you shouldn't assume deboarding doesn't end, just because you still see the loaders, because only the train is supposed to leave, the loader will leave only when you ask for pushback clearance.
It always been like this, even before the update, the only different it's that before the update there was only the rear loader, but it stayed there too even after deboarding.