Loop property might not be encoded properly?

[SkrFractals]

When I put 0 in the loop which should be endless, the windows photo viewer only plays the gif once and stops. My browser plays it endlessly though. But I don't think it's the photo viewer not being capable to loop gifs, because this C# encoder which looks like it's encoding tyhe gifs the exact same way does loop when I open it in the photo viewer: https://github.com/avianbc/NGif