Thanks for this great library!
Unfortunately, I have an issue.
I am trying to create a sort of plugin-in based application. Where the plugins have very restricted access. Basically plain C#, and an API that will be exposed.
When I try to restrict the created app domain, it seems to instantly demand unrestricted permissions when the AppDomain gets created:

Do you have any clue why this is happening?
I've uploaded the project to GitHub, you may view it here.