Compiler bug with dynamic and interface inheritance

bug.cs

namespace CompilerBug
{
  public interface IFoo : IBar
  {
          
  }

  public interface IBar
  {
      void Bar(string name);
  }

  public class Foo : IFoo
  {
      public void Bar(string name)
      {
          Console.WriteLine("Hello World");
      }
  }

  private static void WorkingDynamic()
  {
      Foo foo = new Foo();
      dynamic d = "test";
      foo.Bar(d);
  }

  private static void BrokenDynamic()
  {
      IFoo foo = new Foo();
      dynamic d = "test";
      foo.Bar(d);
   
  }
}