Who was the mysterious masked man at Khamenei's funeral in Iran?

A masked man seen in the front row at Ali Khamenei's funeral sparked speculation that his son Mojtaba Khamenei made a rare public appearance. However, Iran International identified him as Mohammad Javad Khamenei, Khamenei's eldest grandson. He reportedly suffered severe facial burns and other injuries in US-Israeli strikes on February 28, forcing him to wear a black mask.