Fix the mega menu expand/collapse
When modern communication site is collapsed on smaller screens and on mobile, the mega menu does not expand and collapse correctly. You click the header and and the menu disappears, go back in and that section is expanded. Click the next header and the menu disappears, go back in and that next section is expanded. Only then can you click the actual link. The menus should expand and collapse so you can click a link before the menu disappears. It is broken in its current state.
This really is a broken experience rather than a suggested enhancement. I hope this is on a development list somewhere already.