UnManaged Heap allocation

When try to display Unmanaged Heap I get 0 ! With this program on SC20260D (preview4). Is it normal ?

namespace SC20260D_UnmanagedHeap
{
    class Program
    {
        static void Main()
        {
            Debug.WriteLine(Memory.UnmanagedMemory.FreeBytes.ToString());
        }
    }
}

No, not normal, unless you EnableExtenHeap() before.

In that case, can I revert back ?

try to erase firmware will bring it back

That’s it !!! Thanks a lot.