ToArray fails when buffer capacity is larger than its length.

[jlaanstra]

Introduced in #1541

Workaround:

if (WindowsRuntimeMarshal.TryGetDataUnsafe(buffer, out var data))
{
    Span<byte> bufferAsSpan = new Span<byte>(data.ToPointer(), (int)buffer.Length);
    return bufferAsSpan.ToArray();
}