I’ve noticed a rather peculiar quirk with the Preview Panel, which may have been there all along, but never caught my eye, or has only recently resurfaced. Anyway, when “Show all Instances” is turned on, certain glyphs get jumbled together too tightly, despite the fact that all masters (four in my case) have positive side bearing.
In the photo you can see how the long line of T’s is squished together. My question is: is it possible to assign custom spacing between the instances? I’ve tried to exporting the project, all metrics seem fine, so it’s probably just the Preview that gets the sidebearings wrong?