Previously I left a review about being unable to dive in versions after v1.0. I've discovered the issue. It seems that after v1.0 if you assign X to B it will break OMM movement. Assigning it to my right bumper fixed it in my situation. Having the old behaviour would be better, but at least now it's playable.
In terms of a general review, it's a very polished mod with a lot of customisability. It breaks the game, but in a really fun way. It makes the game feel like a playground for movement in way Super Mario Odyssey kind of lacks. It's cool.