[Python] Dynamic submenu items with cursesmenu

I'm using Python's curses-menu package and understand how to make submenus in a menu when the menu is statically defined before .show() is called. I am trying to make a menu item which, when selected, will dynamically make the selected submenu's items. In other words, when I select an item, I want run code to, say, take some user input, and make something like a SelectMenu with each string as an item. Lastly, I then want to use the selected string as input to a function.

Here's what I'm trying:

# Import the necessary packages
from cursesmenu import *
from cursesmenu.items import *

def work_with_selection(selection):
print('You selected {}'.format(selection))

def build_sub():
items = []
for i in range(3):
item = input('Type an item: ')
items.append(item)
selection = SelectionMenu(items).get_selection(items)
work_with_selection(selection)

# Create the menu
menu = CursesMenu("Title", "Subtitle")

# Create some items

# Dynamically build submenu
build_item = FunctionItem("Build dynamic submenu", build_sub)

menu.append_item(build_item)

# Finally, we call show to show the menu and allow the user to interact
menu.show()


It appears to work except that once I chose Exit from the submenu, the parent menu redraws, and the cursor keys stop working. Instead of moving the selector, it give control-characters with letters as in the top left of this:

^[[B^[[A^[[B───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐
│ │
│ Title │
│ │
│ Subtitle │
│ 1 - Build dynamic submenu │
│ 2 - Exit │
└──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘
│ 4 - Exit │
└──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘


I'm using Python 3.

Is using SelectionMenu the right way to go? If so, how do I fix the parent main menu once I return to it? If not, how should I make such a dynamic submenu creation?

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