I’m currently working on a family with .alt characters and some of them are characters such as rcaron.alt, scaron.alt, and so on. I’m not sure this should be happening but instead of compose these characters with caroncomb it’s using caroncomb.alt as if they would be a dcaron, for instance.
I started designing these characters thinking about contextual alternates, that’s why I put this suffix instead of .ssXX. However, if that’s causing a sort of problem I’ll adjust their names.