I succeded to import a moodle-xml question file, containing one order question with 7 matching pairs.
The question shows up with 7 matching pairs for the user, but the teacher can not edit the question.
Only 4 of the 7 matching pairs will be shown in the lesson question editor.
1) export matching question with more than 6 matching pairs (or use the attached example)
2) import into lesson with fewer number of answers in the setting
3) see preview ( should be ok)
4) try to edit the question in lesson (broken)