Gtk.ListStore.insert_with_valuesv missing, causes errors

Continuing from !167 (closed), here's the error it causes:

File "/app/lib/python3.8/site-packages/giara/settings_window.py", line 195, in __init__
    self.list_store.append([value, name])
  File "/usr/lib/python3.8/site-packages/gi/overrides/Gtk.py", line 1009, in append
    return self._do_insert(-1, row)
  File "/usr/lib/python3.8/site-packages/gi/overrides/Gtk.py", line 1001, in _do_insert
    treeiter = self.insert_with_valuesv(position, columns, row)
AttributeError: 'ListStore' object has no attribute 'insert_with_valuesv'

@infirit I doubt it has to do with Arch Linux per se, as I'm having this problem with flatpak, using the gnome 40 runtime libraries.