What I really can't understand is why it has worked before update to 3.2.7
Was your video an indication of a working case ? Because, as I've said my previous reply, having A320 specific loaders using A320 dedicated AKH containers on the ATR is wrong, the proper solution is to have a proper loader loading cargo pallets, but we don't have it so, in the meantime, best to use Belt loader with packages instead of luggage.