We have figured out, that whenever we import courses e.g. in SCORM format, the online course is automatically enabling the "lesson contains assessment" option. This is misleading since it does just enable it, no matter if the import contains an assessment or not and when reporting on "Assessment" there are then courses stating to have an assessment where it is not the case.
We would highly suggest to disable this option when importing courses. Admins shall decide on their own and enable, or, the system shall recognize if there is an assessment and act accordingly.