I am having issues subscribing to !piracy@lemmy.dbzer0.com, but I do think it also happens with other communities on different instances.

I subscribe via the main button or via the plus in the search function. The community may appear in the sidebar, sometimes it does not at all, but whenever I restart the app the subscription is fully gone.

Weird thing is, on another app for lemmy I can still see I am subscribed, so I am not sure what is going on.