Hi Guys,
I am not using any AVR. I will update MediaInfo of these MKVs soon. Think the audio is downmixed to 2 ch PCM. All these are 1:1 rip from my personal UHD disc but with non-English subs and non-English lossless audio tracks excluded.
I will try to reproduce this issue with non-Atmos / TrueHD mkvs.
Found another thread with the same issue: My Vero 4k+ crashes when I seek some movies - #62 by ac16161