May be that has something to do with the radio transmitter in the remote control.
Because the range of mavic 2 pro is 8Km(as per DJI website) and the range of air 2 is 10Km.
I use filter by Pgytech....
The Nd value depends on the subject i shoot but i usually maintain 1/5 sutter speed(it depends).
Most used Nd is 128,256 for LE photos and 32 for videos.