Roon identifies the following albums in my library but has not added any genre tags to them this means they are rather lost in focus.
Carmen McRae - Ms Jazz
Leonard Cohen - Greatest Hits
Ragpickers Dream - Mark Knopfler
The Complete Songs of Robert Burns - Vol 7
I have some others less well known that this happens to as well that I am not so surprised that Roon has no information. Happy to provide those too if that helps improve things.