If I understand correctly, the corpus there is only practically acting as support in the dead corner and is otherwise not used at all. I don’t know if such a beveled cabinet actually brings any advantage – the "beveled" parts are still dead, and the problem of the cabinets blocking each other at the corner is even worsened. Without a beveled cabinet, this concerns the two cabinets to the right and left of the corner; with a beveled cabinet, it includes those two plus the one in the corner (in this case the oven, which I would BTW always install elevated if possible and not under the cooktop).