I use Flac file and Hi Res output. When I receive notification sound goes to speakers for second and than goes to airphones. I turn off Short Audio Focus Change. I have HTC 10 on Stock rom Android 8.0.
Hi I'm still have this issue. When turn only right channel, sound was on a little bit on left channel. I try total commander player and this aps could turn off left or right channel to 0 db. I have htc one m8 (android 5.0.1 - stock rom)