Custom menu breaks when nested deeper than 2 levels.

Test menu structure to show the issue

FIRST

• menu1.1
  SECOND
• menu2.1
• menu2.2
  • menu2.2.1
    • menu2.2.1.1
      THIRD
• menu3.1

In line 2346 in the function "convert_text_to_menu_nodes($text)" "$depth = $lastdepth - 1;" depth step back is hard coded to 1 step. That does not work when nesting is more than 2 steps and you need to go back to root.