Duplicate /c, rename c.001 to ccedilla. Open the cell, find myself looking at the Ccedilla instead. This happens with /ae and /oe too, perhaps others. The only way to make it work correctly is by using Add Glyphs or a List Filter.
Glyphs is getting something crossed. This isn’t new, but I don’t know if it has been reported. Happening for well over a year now so others may have seen it too. Not a major bug though, merely an annoyance when I forget it happens.
Were you already aware of it?