Poweramp build 877
My phone is Vivo Nex 3S 5G, running Android 10 stock. It has a hi-fi DAC which is not compatible with the high-res output.
For builds prior to 860, selecting high-res output will activate the DAC but unable to play. The current build does not activate the hi-fi DAC at all if hi-res output is selected. However, both OpenSL and AudioTrack outputs can activate the DAC and play without issue. Unfortunately both outputs locks the sample rate at 48 kHz which is less than ideal.