Generated font produces some filled icons

[N-Raillot]

When i generate my font with

function buildFont() {
  return src([INPUT_SVG_GLOB])
    .pipe((gulpTransform as any)('utf8', processSvg))
    .pipe(iconfont({
      fontName: 'my-font', 
      formats: ['ttf', 'eot', 'woff', 'woff2'], 
      timestamp: runTimestamp,
      fontHeight: 1001,
      normalize: true,
      prependUnicode: true
    }))
    .pipe(dest(DIST_FONTS));
}

function processSvg(content: string, file: string): string {
  // Remove the frame <rect>.
  return content.replace(/<rect[^>]*id="Frame"[^>]*\/>/gm, '');
}

Some glyphs in the generated font appears filled with black, some don't :

Expected Icon :

Glyph in generated font :

I could not find anyone with this issue so far.

[pioug]

It happens to me sometimes as well. It can be fixed by editing the SVG by changing how the shapes are layered. Try to group some shapes and play with union, difference, intersection...