Google Maps Lists only visible in Web Version not in Mobile App (Mac/Apple)

after switching to a new iPhone (11 max pro), all my lists with saved places are gone on my phone but they are still there in my Google account when I access maps via Web. On top of that, the minute I create a NEW list on my phone, then close and open the app, the list is gone again. But it is there on when I access google maps via a computer. Only things I can save are "Favorits" "Want to go", "Label", "Marked sopts", "Travel plans" but no lists. Can anyone help?:-)