AutoWidth: false +rowgroup + column visibility = background issue

Illa

Link to test case: https://jsfiddle.net/09mpsuLx/1/
Description of problem:
1. When you choose to hide a column and then make it visible again, the rowgroup cell colspan is correct, however visually it is one cell short.
2. Image of incorrect result: https://ibb.co/jwGqyqz
3. Upon removal of autoWidth, it works properly