Why was the hamza of "Ibrahim" written as hamzat qat' (a قطع hamza) in the Holy Qur'an and as hamzat wasl (a وصل hamza) in other places?

The ten reciters (Qurra') are in agreement that the hamza of "Ibrahim" is a hamzat qat' (a cutting hamza), and none of the scholars have mentioned that it is to be recited with a hamzat wasl (a connecting hamza) in the Qur'an or elsewhere. If it is found written without a hamza, that is likely an error by the transcriber or printer.