The genres appear for me, using Roon in English. Do you use a different language (as there have been changes to language support for genres in the latest version)?
I’m confused by your version. The latest is 2.0 build 1259, just to be sure
First of all, the language setting makes no difference on the problem.
Second, except for my own defined tags, also no tags at all are shown when looking at albums in my library.
But with respect to the software version there is a problem it seems.
I now see that my Mac, iPad and iPhone are all running 2.0 1259 while my Roon nucleus server is running 2.0 1211.
Somehow my nucleus has not updated beyond version 1211 although I have automatic updates switched on.
Now I have to figure out how to get my nucleus onto version 1259…
I have rebooted the nucleus, and then roon finally showed there was an update available for the nucleus.
So I updated, and now everything is on 2.0 1259.