As far as we know, the 96kHz dropout issue with CCAs is a firmware issue that was introduced in a firmware update sometime in July. Google seems to know about it, but as far as we can tell by what they’ve said publicly, they haven’t prioritized a fix. It’s a problem affecting anybody trying to do 96kHz output (not just Roon) and unfortunately, I think the most productive thing you could do right now is speak up in Google’s product forums to let them know that this issue affects you (as well as to provide more debugging information for them).