If you are displaying another content type in that module you need to export an app with that content type separately, app will not export any child content types shown inside moules or using seblod search/list fields. Then check module settings as content type ids change between sites.

Thanks Klaas. The "map" module is exported with the app is also available on the new page. But in the content view is just the placeholder appears. I do not know where to even look. It is on the new page just like in the old site. For testing, I've created a new field with a Joomla module and to a custom module with text. But this module is not displayed in the Content view.

First thing to check is that Seblod content plugin needs to come before all other content plugins.

The Seblod Content Plugin is located in the first place.