Why is this a critical issue and what exactly is broken? There is valid image data on your LiveView, the interface looks normal, so nothing looks broken to me.
You're right. This doesn't have to be a critical issue. But, one major point of Magic Lantern is the revamped video interface and the things that go with it. There is no point of me having Magic Lantern if this part doesn't work.
Let the user guide and the menu help be your friends.
I looked at the user guide to try to fix this. It said to make sure that LiveView is enabled, and it still has no hint of Magic Lantern in the LiveView.