Unable to get Direct Play to work on HEVC when switching audio tracks

I’m unable to get Direct Play to work on a HEVC encoded video when I switch to another supported audio format (aac or ac3) on different audio track. The server shows the audio is in Direct Play mode, but the video is transcoding the HEVC to H264. Is this a bug with the app or is it a problem with HEVC?

I would prefer to keep my foreign movies with their original language audio in first slot and English for the second slot. Will I have to change this going forward?