Indeed, set @sam_nazarko on this communication. Sam, does it make sense to make the default disabled for “Sync playback display”?
I think the default is disabled. I’ve never had to unset it.
Yes I saw that too yesterday 
Now all the HD Formats (I can test) work again, many thanks!!
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Are you still running the March stable release or have you upgraded from stretch-devel?
If you play Atmos, does your AVR output the correct (fallback) format as reported by mediainfo?
It’s disabled by default.