Any mod I subscribe to will not download and I must go on a world with mods to download that mod. Here is an example. I go on a world with the Carney mod then I get the mod.
Steps to Reproduce
clean mods loads of times until your mods disappear then go on a world with a mod and It will download it then try to subscribe to a mod and it won't download
This issue has not been confirmed by a developer yet.