Border-Image has glitches in MacOs

[Aviator]

Hello I have a really weird behavior. My Border Image gets displayed broken on mac Only the White areas if i replace the image with a black image it is solid black with no stripes.
Mac Os 10.14

Mac Os 10.14 with a black image instead:

Windows:

Both uses the same css:

MainFrame {
    border-image: url(':/images/app_background') 0 0 0 0 stretch stretch;
    border-top:0px solid #000;
    margin:0;
    padding:0;
}

Any one has an Idea where these glitches come from? Or have a suggestion to a better aproach to make a background which resizes correct.

Thank you Sascha

[SGaist]

Hi,

What kind of image is it ?

[Aviator]

Hey it is a PNG

[SGaist]

Would it be possible to share the original file ?

[Aviator]

You mean the orginal image?

[SGaist]

Yes, please.

[Aviator]

Here is the Image
https://drive.google.com/file/d/1sFSBt0iHtsbDvHobBKtI1F5jUZWvfbty/view?usp=sharing