DTS-MA and 24FPS

Is there any issues with DTS-MA pass through and video at 24FPS?

I have a minix U9, latest firmware, with Kodi V17.1, latest from play store, if I have auto frame rate switch on in Kodi I get no sound for DTS-MA playback.

Yet if I turn auto frame switcher off, I get sound,

Any one else had this?

I think my mkv file is a 24FPS movie.

Neil