VM: (bug) Delegate.Method on an open delegate to an inherited private generic-base method pollutes the derived type's reflection cache

using System;
using System.Linq;
using System.Reflection;

public class Base<T>
{
    private int Secret() => 42;

    public static Delegate MakeOpen() =>
        Delegate.CreateDelegate(typeof(Func<Derived, int>),
            typeof(Base<string>).GetMethod("Secret", BindingFlags.Instance | BindingFlags.NonPublic)!);
}

public class Derived : Base<string> { }

public static class Program
{
    static string Methods() => string.Join(",",
        typeof(Derived).GetMethods(BindingFlags.Instance | BindingFlags.NonPublic).Select(m => m.Name));

    public static void Main()
    {
        Delegate d = Base<string>.MakeOpen();
        Console.WriteLine(Methods());
        Console.WriteLine(d.Method + " reflected=" + d.Method.ReflectedType);
        Console.WriteLine(Methods());
    }
}

MemberwiseClone,Finalize
Int32 Secret() reflected=Base`1[System.String]
MemberwiseClone,Finalize

MemberwiseClone,Finalize
Process terminated.
Assertion failed.
false
   at System.RuntimeType.RuntimeTypeCache.MemberInfoCache`1.MergeWithGlobalList(T[] list)
   at System.RuntimeType.GetMethodBase(RuntimeType reflectedType, RuntimeMethodHandleInternal methodHandle)
   at System.Delegate.GetMethodImplUncached()

MemberwiseClone,Finalize
Int32 Secret() reflected=Derived
MemberwiseClone,Finalize,Secret