Hello, I am perturbed. I have set typoLineGap parameters in my instance (to override the masters’ settings). typoDescender is correctly overridden (master: -220, instance: -286), but typoLineGap isn’t (master: 0, instance: 200). The export has typoLineGap 0.
Sorry. Betriebsblindheit strikes again. I was looking at the lineGap entry in the hhea table instead of OS/2, and I had not set a hheaLineGap parameter.