il-repack: Bug: cannot reduce access in 2.0.15

The following code fails when run through ilrepack on windows. the error is Unhandled Exception: System.TypeLoadException: Derived method 'Meth' in type 'TestIlRepack.ArrayHandler``1' from assembly 'x, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' cannot reduce access.

The method in Class3 is having its access changed to internal from public while the base class remains public.

using System;
using System.Threading.Tasks;

namespace TestIlRepack {
    class Program {
        static void Main(string[] args) {
            GC.KeepAlive(new Class3());
            System.Console.WriteLine("done");
        }
    }

    class Class3 : Class2<Array> {
        public override ValueTask<Array> Meth() { 
            throw new NotImplementedException();
        }
    }

    abstract class Class2<T> : Class1 {

        public abstract ValueTask<T> Meth();

        internal override ValueTask<T2> Meth<T2>() {
            throw new NotImplementedException();
        }
    }

    abstract class Class1 {
        internal abstract ValueTask<T> Meth<T>();
    }
}