Hi Daniel.
Yes, this works.
Nevertheless the behaviour and the way to deal with it is strange and differs from all the wordpress themes I’ve used before. When I usually create a site like e.g. “site1” and some sub-sites (“site1-sub1” and so on), then add them to the menu (in Design > Menus) via the “sites” selection, there was never a duplicated item “site1”.
Can you adjust the code in a future update please?
Thank you and best regards, Christian