fontdiff mis-places Cherokee accents

[brawer]

Cherokee accents were mis-placed by fontdiff when running this command:

./build/out/Default/fontdiff --before ~/Downloads/NotoSansCherokee-VF.ttf --after ~/Downloads/NotoSansCherokee-VF.ttf --specimen specimen-Cherokee-diacritic-lowercase.html --out out.pdf && open out.pdf

The specimen file is here; font was taken from here. The same font works perfectly fine with FontView, so this must be a bug in fontdiff.