Hello,
I'm building a for that's wrapped in material-ui Grid elements. Unfortunately, I can't seem to combine it with your form, because it simply doesn't see the input children.
I checked the source code really fast - from what I've seen, you only check children 1 level down? Since the grid elements are wrapped in at least 2 containers (Grid container and grid item), maybe that's where the issue lies?
I guess I'm not the only one using grids in my forms. It would be very helpful if you solved this issue.