Opt out of the beta.
... As one can see the Mod tab is disabled, as you can see in the picture.
It looks the same on my end. Does it not highlight when mousing over it?
..
The Mod tab is totally disabled in the previous picture, and you can see in the new picture in the actual game the mod screen is empty.
Also, I attach my CK2 Subscribed mods.
...
Do the mod files exist in Documents/paradox/ck2/mod/ folder?
If not probably Steam or the game lack access there. Go to System Preferences > Security & Privacy. Then select the Privacy tab. Scroll down to files and folder in the left column. You’ll see a list of apps and the folders they need access to. Check the box to give access.
Allow accessibility apps to access your Mac
Specify which apps can access and control your Mac for accessibility purposes.support.apple.com
You only see that one file descriptor.zip ? None for the actual mods you are subscribed to?
If so it seems clear that something is stopping Steam or the game from copying the mods from where Steam downloads then to, to that folder. I would have thought that had to be the Privacy stuff I mentioned. Unless you have an antivirus app active that might do this?
Or has iCloud grabbed your Documents folder perhaps?