I have two pairs of Bluetooth headphones (stereo).
With one pair, when I adjust the headphone volume using the buttons on the headphones, it adjusts only the headphone volume and not the phone's Bluetooth audio volume. This is my desired behavior. (My car's (Bluetooth-capable) audio system also displays this behavior - when I adjust the volume in the car, it adjusts only the car's volume, not the phone's.)
With the second pair, when I adjust the volume using the buttons on the headphones, it adjusts both the headphone volume and the phone's Bluetooth audio volume - making for large steps (large increases and decreases in volume) - too large to be useful.
How can I make the first behavior the default behavior? i.e. make my phone ignore external device's volume commands by default.
Phone is rooted Moto G6 with 8.0 stock