Metrics have been changed in glyphs

I generated a variable TTF with [this file](https://github.com/weiweihuanghuang/Work-Sans/blob/master/sources/WorkSans.glyphs) with `fontmake -o variable -g WorkSans.glyphs` and I noticed so far a few of the diacritic glyphs in the Black (master) weight have been shifted:

You can see the correct metrics on the right, the left are diacritic glyphs made of components... I was having trouble generating a static TTF due to [this issue](https://github.com/fonttools/fonttools/issues/1380) so I couldn't have a further look.

Furthermore the issue is not present when I view the font in FontView, but is there on Chrome.

This issue is not present when generating a static TTF with Glyphs App