Spacing issue in "th" when adjusting character spacing in Sketch

[cozysd]

Forgive me for maybe not using the right terminology here. I'm just some guy. :)

I've got Fraunces installed and I'm playing with it in Sketch. When I change the character spacing to anything but 0, everything seems to react normally except the "th" in "the", which pops out a bunch of extra space. Seems to happen across the fixed fonts. Quick screencast: https://cozy.es/7qq91v