I just tried removе the sound speed simulation in the B_Plane_Fighter_01_F sound sets, after tests the sounds started to appear without the huge delay you was able see in video in comment above ↑↑↑↑↑
You can see a video of this test here: https://youtu.be/uF-3orpkeA4
Maybe there's something wrong with the speed of sound formula for airplanes, I hope that the found info will help to fix this bug sooner