you cannot reproduce the bug because you probably import the data into joomla!4
immediately after its installation from the green end of installation button.
Error, all the data is not imported, you can see it by going to fronted.
No for all the data to be printed and placed as on the original template, y
ou have to go to the main administration panel of the backend of Joomla!4 and click on the blue button "import data"
the data is therefore really good imported but that has the consequence of deactivating the administrator modul of the menu.
I hope that my help will help other people.
Félix from France.