Hi,
This is already in our To Do under https://www.ventismedia.com/mantis/view.php?id=16249

Thank you for reporting and suggestion we will be checking it out.

Dear Devs,

I suggest to implement a solution for a interrupting Diagonal Movement from menu to submenu.

Details on the issue: When hovering the mouse over navigation menus to display a submenu, then moving the mouse in a straight line to the submenu contents, the user may accidentally hover over other menus, which in turn activate the wrong submenu.

These two topics at least explain the problem into details -- and maybe offer the solution right away:
https://codyhouse.co/ds/components/info/diagonal-movement
https://agib.dk/posts/2018/solving-the-diagonal-submenu-hover-problem-with-css.html

Thakn you for the consideration. M

p.s. I love to use the new MM5. Thank you