I am using the new upgraded mobile menu and have found that menu items are being cut off the end of the menu.
The test site below mirrors the menu structure of my website:
The Landing page is configured to not show in the menu, all other pages are shown in the menu.
Most of the time the menu is cut off, but occasionally I have seen it work ok.
It always works ok in preview mode.
Link to test site: https://sigpoggy.wixsite.com/website-1