Hi Umberto,
is it possible for the marshaller to ignore the plane when approaching him/her from behind ?
That is the case at some parking positions, e.g. Parking position 3/4/5 at Tivat LYTV.
The marshaller correctly stands with the back to the taxiway, so when approaching him/her coming from Runway 32 the marshaller sequence already gets initiated on the taxiway. So when reaching the parking position the sequence is already finished.
I attach a screenshot to illustrate. Parking position 3. The orange circle is the marshaller position. The blue arrow is a the plane approaching the parking position