Yes, prone carries unconscious with it as a sub-effect - so literally anything that knocks a character prone will automatically end their concentration without a save, including effects which knock prone without themselves offering a save.
In the feedback section, pinned at the top, there is my thread on spells; it covers a lot of those issues in passing. It's out of date, since I haven't had the time or willpower to update it, but many of the issues it brushes on or details have been present since early EA and are still present now, despite heavy reporting.
I have another thread that focuses specifically on conditions (this one did not get a sticky at any point, so it gets lost) - it's here:
Focused Feedback: Status Conditions. It, too, is out of date now, and doesn't cover the majority of Larian's homebrew conditions - it focuses mainly on the D&D 5e conditions and their implementation. Unfortunately, the vast majority of the problems highlighted there in early EA have also continued on without being improved or corrected.
