wp cli for language switcher

Hi & thanks for the plugin
Currently I’m able to configure most of wpm using wp cli patch and update options.
But when I create a menu via wp cli containing the language switcher and setting the link value to #wpm-languages, the menu is not visible until I login to WordPress and save the menu again (without editing anything).

Using:
wp menu create myMenu
wp menu item add-custom myMenu ‘Languages’ ‘#wpm-languages’

As I’m new to WordPress, I probably miss other options or tasks I should run to make the language switcher visible within the menu only using wp cli (Jenkins build process).

Thanks in advance for any helpful answer.

Michael