Hi, I have done some tests and log file for DTS MA 5.1 track, which plays with 8 RAW channels is enclosed. This happens with all DTS MDA 5.1 files (MKV).
Log file is: https://paste.osmc.tv/vizutoluha
Video starts with AC3 5.1 which plays with 6 RAW channels, but as soon as I switch to the DTS-HD MA 5.1 track it starts to play with 8 RAW channels. Which is 2 to much I think?
Stereo plays fine in 2.0 PCM
DTS 5.1 plays fine with 6 RAW channels
DTS MA 5.1 is not oké, plays with 8 RAW channels
DTS MA 7.1 plays fine with 8 RAW channels
Dolby 5.1 plays fine with 6 RAW channels
Dolby HD 7.1 plays fine with 8 RAW channels
Also see picture in which DTS-MA 5.1 is in place, but you can count 8 RAW channels 
