When I copy glyphs from one font to another, or duplicate a glyph within a font, the new glyphs do not show up in the font list or in the edit window. I can fix the issue by running Update Glyph Info on the whole font, but it’s ugly.
EDIT: I also just got a crash when running Update Glyph Info from within an edit window. I guess it might be related to the other issue.