abstract controller class derived as regular controllers in two different areas hits same cache

[kavhad]

public abstract class AbstractProtocolController : Controller {
        ...
        [DonutOutputCache(Duration = 300, VaryByParam = "id", Location = OutputCacheLocation.Server)] 
        public ActionResult Detail(int id)
        {
             ...
        }
        ...
}

This abstract controller class is implemented in two concrete classes in separate areas.
When I do a web request to the action in the first area and then to the other action in the second area the view from the first area is served from cache. A note the concrete classes have the same controllername, but this shouldn't be an issue since they are still in two different areas.

I have only tested this out with the current pre-release version on NuGet (MvcDonutCaching 1.3.1-rc1).