menu-toggle missing .sublist-toggle which causes hidden items to display on small devices.

Version 4.4
DefaujltClean\Content\css\styles.css: Line 6679
Add .sublist-toggle to correct.

.menu-toggle,
  .sublist-toggle {
    background: #4ab2f1 url('../images/menu-icon.png') right center no-repeat;
    padding: 15px;
    font-size: 15px;
    font-weight: bold;
    color: #fff;
    text-transform: uppercase;
    cursor: pointer;

Sublists have an individual .sublist-toggle class (#L6730). Can you explain the conditions to reproduce it?