the 6N2 Polo GTI also has an issue with the front passenger door, it will not unlock from inside once the central locking has released, once opened from the outside the inside handle works normally
this remained unnoticed until a warrant check (normal use is unlock car, open door from outside, get in, open door from the inside, get out, lock car etc.)
any thoughts? lubrication issue? i.e. something sticking which is then released by opening the door from the outside? the lever doesn't feel any different in either case