I just added a bunch of community subscriptions via the webpage of my instance (lemmy.fmhy.ml) and they are visible there. But going to thunder they do not show up.
I logged out and back in, no change. I opened a different app I use, Voyager, there I see the communities as well. Is there a way to get them to update in thunder?
Try clearing the app’s cache and all its data. Then log in again.
Nope, no change