There seems to be a bug with the grid elements on smaller breakpoints. I set the to 12 fixed columns, the child to span 12 columns. As you can see it breaks out of the container. The same thing works when using vertical stacks or columns.
It works as expected when setting the parent to 1 col and child to 1 col. Same for 2, 3, 4 etc. But everything at 12+ does not work as intended