I found that the word 枝 is used not only as zhi but also as qí, but I could not find the entry on macOS Chinese dictionary. Also, when I tried typing it qi on iOS, the keyboard didn't show 枝 on the conversion candidate.
That said, Pleco shows the entry 枝 both on zhi and qí. That made me confused, but why is the qí not showed and also is there any difference between two?