Audio playback issue through Soundbar and Sony Bravia Android TV

Recently whenever I try to watch a movie on my Sony Bravia Smart TV (Android TV) through my Sony Soundbar (sa-ct290) I get no audio unless I change playback settings to convert to 1080p HD 8Mbps. Original quality or convert automatically makes no difference. If I switch to my TV speakers the audio works fine without having to change playback settings.

If I use another player, like on my Mac or Amazon Firestick I have no issues with audio whatsoever.

Soundbar is connected by HDMI ARC - I’ve also tried fibre optic but no difference.

Server Version#: 1.18.6 (QNAP)
Player Version#: 7.27.1.15203 (5c57babb)

What are the audio track types?

Sorry, I meant to say in my original post, it’s DTS 5.1

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