✅ why dispose call is the latest in the chain?

using var refStruct = new RefStruct();
public ref struct RefStruct
{
    public void Dispose()
    {
        Console.WriteLine("Hello from ref struct!");
    }
}

using var simpleClass = new SimpleClass();
public class SimpleClass
{
    public void Dispose()
    {
        Console.WriteLine("Hello from class!");
    }
}

using var refStruct = new RefStruct();
using var simpleClass = new SimpleClass();
var factory = Factory.Create();
Console.WriteLine(factory);