Garbage data after stackalloc field initializer

Question

I am using .NET 6.0 on Windows 10 with Visual Studio 2022 last Version, last Build, and this code runs fine and even SEEMINLGY does what I want: have a look:

But: keep a closer look on the "Init(in ReadonlySpan<Char> a)" I can assign my new(a) to the nodes[0], no error or whatever. But when I do, the nodes[0] has STILL garbage data in and I cannot store my type in that [0] field of the stackallocated span field?

Is this a bug in .NET 6.0 or am I doing smth bad/wrong?

Pls help!

Ok here the exact code:

public ref struct MyType
{
 private Span<RefType> nodes = stackalloc RefType[30];  
    
     public unsafe  struct RefType
     {
          public char* data;
          public int length;
          public RefType(in CharSpan a)
          {
             //AsRef(span) is a private method, which gives me back a valid pointer to the span, this works ok in my code! dont bother to much with this
             data = Unsafe.AsPointer(ref GetRefTo(s))
             length = a.Length;
          }
     }

public unsafe MyType()
{
    nodes.Clear();
}

public unsafe void Init(in ReadOnlySpan<char> a)
{
    //nodes[0] = new(a); //this does not work!
    //this does not work aswell!
    nodes[0].data = Unsafe.AsPointer(ref MemoryMarshal.GetRef(a));
    nodes[0].length = a.Length;
    Console.WriteLine(*nodes[0].data + "        " + 
                                         nodes[0].length);
}

public string DoWork()
{
    //Thread.Sleep(5000);
    return nodes[0].ToString();
}

}