DTS-HD MA works with my setup with S905 (see signature). The S905X box will arrive on Friday, but I am sure it will work, too.What avr are you using? What are your test files?
Please note that there might be some incompatibilities between some avrs and the way kodi signals dts-hd formats. With my receiver, DTS-HD HRA 7.1 is not correctly recognized by my avr. This is a kodi/avr problem and happens with an x86/Windows 10 box as well. See DTS-High Resolution. What's the score?
As I wrote earlier, the problem seems to be occuring only when booting from USB DOK. DTS works fine when booting from TF card.