Color font issue (random scaling of glyphs) in Word and PowerPoint

Hi, I’ve made a layer colorfont (Latin Extended glyph set incl. kerning) which works well in the design apps and browsers. When I’m in Word (16.45 on Mac OS 10.15) or PowerPoint and start typing, I get strange seemingly random scaling of some glyphs (see images) very frequently. When I paste text all works well.

Does that ring any bells?

I’ve generated the font as ttf and otf, with COLR/CPAL and/or SVG, all fonts seem trigger thethe same issue in Word and PowerPoint.

Very often it does this:
Screenshot 2021-02-27 at 15.39.31
Screenshot 2021-02-27 at 15.39.59

Sometimes it works:
Screenshot 2021-02-27 at 15.40.11


that seems to be an Office bug. One thing you might look into is the bounding box of the default (black) glyph.

(Thanks for your feedback. The (black) fall back glyph has the same bounding box as the orange and yellow layer combined, containing the base glyph and the underline element. I’m clueless what to try next.)

Can you ask the question on