Base64 image in Forge Custom UI export to Word

Forge Forge UI Kit and Custom UI
1

I have a Custom UI Forge macro that exports an base64 encoded image to Word. In PDF export, the macro is working fine. But when I export to Word, I have this error:

<img src=3D"https://<instance>.atlassian.net/wiki/plugins/servle=
t/confluence/placeholder/error?i18nKey=3Deditor.placeholder.broken.image&am=
p;locale=3Den_US&amp;version=3D2" title=3D"Missing required attribute: {htt=
p://atlassian.com/resource/identifier}value" class=3D"transform-error" data=
encodedxml=3D"%3Cac%3Aimage+ac%3Aalign%3D%22center%22+ac%3Alayout%3D%22ce=
nter%22+ac%3Asrc%3D%22data%3Aimage%2Fpng%3Bbase64%2CiVBORw0KGgoAAAANSUhEUgA=
AAtAAAAKUCAYAAAAtng%2FmAAAAAXNSR0IArs4c6QAAIABJREFUeF7snQvUb1O5%2F6dLEipyyS=

And this is the export function

return doc(
        mediaSingle({ layout: 'center' })({
            type: 'media',
            attrs: {
                type: 'external',
                url: `data:image/png;base64,${imageBase64String}`,
            },
        }),
    );
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