seems feedback but it has a fixed frequency which seems odd for a regular guitar distortion feedback.
also seems it doesnt have any harmonics. it’s just that 22khz freq.
I can cut it with a noise gate and when I play I dont hear it except when not pushing strings hard
still is annoying because I still can hear it a milliseconds when the noise gate is not triggered (I couldnt find a good NS that has near 0ms release time and doesnt sound horrible when is cutting it (it starts to go on and off very fast)
Actually, that makes sense
I read it through quickly, but the human hearing range (of a newborn and not always) goes only to 20k @mrwolf.
Probably you typed it wrong, but I toke it only for the “high pitch noise” part