generally it seems to be some issue with workshop mounting the addon, perhaps you can try disabling and then enabling it, or uninstall and install it again and see if that helps

Originally posted by PenolAkushari:

perhaps you can try disabling and then enabling it, or uninstall and install it again and see if that helps

I tried uninstalling and reinstalling, but I did it again and it worked. somehow?

steam issues i guess. a bit outside of my competence really

I seen discussions about addons disappearing. From what I can gather, it has something to do with Cloud sync and Steam workshop and memory cuts. So, for memory; if it like low it will sometimes just flat out remove addons in order to save, is how I see it proposed. So, for Steam Workshop, it forgets it, is how I see it proposed. And for Cloud sync, no idea, just bad synchorization happens, may be in cause together with Steam Workshop, is how I see it proposed.