Data Model In Work class from 24.1Version

hi i’am facing a issue where.When i’am trying to import the Entire application from version 8.8.1 to latest 24.1 version through product file. The fields that are present in the datamodel is not displaying.But present in the app explorer.

When i tried to create a new field it created and after refreshing again the field is not displaying but present in the App Explorer.