Nested submenus not behaving correctly when switching from multicolumn menu to smallscreen accordion

We are using the multicolumn style for our widescreen layout, and accordion for smallscreen.

Our menu tree structure is as follows:

Root
- Submenu
-- Column
--- menu item
etc

When switching to smallscreen, the Column menu items fly out on hover, rather than expanding/collapsing when the accordion parent is clicked. Upon closer inspection, nested submenus are not receiving hide classes when the accordion is built. We've adjusted sfsmallscreen.js to capture all child submenus.