Please tell me how you tested it. You can take a video to explain the problem you encountered and send it to us via email. It is best to attach the source of the video that you play. We will test this problem.
I use core elec as well for dts HD and master audio.
My blu ray library plays with master and dts HD audio. A small problem is video and music are becoming out of sync after a few time.
I suppose this has to be the frame rate.
My old iconbit player doesn't has this problem and plays master audio and dts HD flawless.
I have the same problem no HD audio passthrough under Android. CoreELEC works.
I've just discovered some differences between the two OS audio settings in Kodi maybe that is the root cause.
In Android the audio output device is grayed out also the passtrough output device but in CoreELEC I have options to choose. The TrueHD and DTS-HD option is not available in Android but CereELEC yes.
Blue pictures Android
Red pictures CoreELEC
Dear Beelink are you aware of this issue? Any solution please?