Testing Joomla 4 with Maxi Menu CK

I am testing Joomla 4 locally. I use Maximenu CK on quite a few sites so I started testing it. Installation is no problem. But when I publish the module and assign it to all pages the frontend is no longer accessible (See screenshot). Also on the screen where I select a menu, the selection seems to go OKE, but the selected menu doesn't show up in the field to the left of the "Select" button. But when I click on "Edit" I can edit the selected menu. I wanted to add a screenshot of that screen as well but it exceeded the limits.
When I revert back to the original menu module and depublish the MakeMenu module the frontend is accessible.

Hi
it was tested with the Joomla 4 alpha, not yet with the beta
there are still some work on it , but this is in the pipe like my other extensions

I will publish soon an article with the list of the J4 compatibility for my extensions
CEd