Double underscore components to affect LSB too

Glyphs
21

I’m currently getting a crash when I set the LSB of my /ghestroke-cy.sc to «=+10». Its two components are automatically aligned via a «center» anchor (which is not produced automatically in /ge-cy.sc). They have automatic alignment enabled.

Source file on GitHub: https://github.com/CatharsisFonts/EauDeGaramond/blob/master/3.%20Glyphs%20Source%20Files/EauRoman.glyphs

EDIT: Once of the components has some horizontal scaling applied; could that be an issue?

22

What version do you have? Can you try the latest cutting edge version? If works fine for me.