My preference would be to allow the refs discretion to award a penalty
A. For deliberate handball and
B. If in their opinion a players arm/hand was in such a position that handball would not have occurred if the player was in a “natural “ position for the context of play.
Eg Standing in a wall...
I’m going to have to watch a replay of the incident as I was convinced Mitoma was fouled/ taken out as he played the ball into the box. Not seen that mentioned so maybe i was mistaken.