No matter how long I wait in the main menu, mods won't automatically detect updates.
I have to manually go through the workshop mod lists to get the up-to-date versions.

It used to be working for me for a bit:
when I was using a different internet connection.
But on my current connection it never works as expected.

Maybe some packet size issue or MTU/MSS?? I don't know how the internet works, I'm not sure.