[jQuery] Superfish - Tabbing through menu when it's a nested ul causes the menu to disappear

I'm doing some accessibility testing with superfish. I have the sf- menu ul as the child of another list item. After tabbing through the entire sf-menu, it disappears. Any suggestions? It is nested as follows. ul - li - ul sf-menu

[jQuery] Superfish - Tabbing through menu when it's a nested ul causes the menu to disappear

I'm testing the accessibility of the Superfish menu by tabbing through it. My setup is such that the sf-menu is nested within an li of another ul. The first time tabbing through, everything works as expected. But, once you've tabbed away from the last item in the menu, the menu disappears.