When I copy+paste an object that contains a corner component it works, and has the corner elements from the old glyph, but if i modify the second glyph and copy+paste again into another glyph it looses the corner element.
Can you make a screencast, perhaps with quickCast?
Sure. Here it is. I got Version 2.3.1 (922) under os x 10.11.6
Thanks for the report. I fixed it.
Nice, thanks!