I believe I found a bug, but I can’t always reproduce it. Here it goes:
When trying to make a group-to-glyph kerning pair, sometimes slash isn’t recognized. Haven’t tested with other glyphs though, but I tested with multiple .glyphs files, and some work as expected, others don’t. The glyphs in this project are imported from outlines, if that matters.
When the glyph isn’t recognized, it shows its UUID instead of the glyph name.
In the image above, the first selected kerning pair is the locked pair value, and the second one is the unlocked one. The second one shows correctly in the glyph tab, but in the Text Preview panel and in an app using the exported font shows with the locked pair value instead.
(Ignore the lack of spacing in the example. I removed it to better show the issue).
UPDATE:
Restarting Glyphs seems to solve the issue! It now shows as slash in the Kerning panel, the Text Preview panel now shows the correct kerning, and a reexported font also shows as expected.