yes, when I restore the MBZ course template as a normal course restored by itself the restriction appears.
Here it is my procedure:
Logged as moodle administrator I use "Site administration - Courses - Upload courses" to upload all my courses using a csv file with this fields:
I have 2 types of restrictions, the first is on the topic "Iscrizione Esami", and the other are on the "Reservation" activities used for the exam sessions.
In the upload process I choose for "Restore from this file after upload" my MBZ file (attached below) created from the course "2019/2020 - AAA Esempio"
After the process I obtain a course like "2019/2020 - Corso di test n.200"
You can see the courses pages in the attached Courses.pdf file.
It keeps all the things, including the restriction on the Reservatin activities, but not the restriction on the "Iscrizione Esami" topic.
I hope this time my situation is more clear, and I bag your pardon for my English.