by Ken Task.
One more item ...
During backups or restores Moodle uses moodledata/temp/backup/
as a build area. In some cases, Moodle actually uncompresses the .mbz backup to rebuild a compatible backup to restore.
The build directory is a hash name ... like a check sum number seen in your output. On a failed backup or restore the build directory remains ... not cleaned up until the clean up task in the cron job runs. So for a little while one can inspect stuff.
With moosh: moodledata/temp/backup/moosh_restore_5953d23ceb530
Inside that directory one should find .xml files which are roadmaps to things ... like quizzes/test. There is a quiz or questions.xml flie which can be opened with a text editor and inspected. One could use a find command in nano or any text editor for any settings related to questionbank to get a clue/hint.
Just a thought. ;)
'spirit of sharing'. Ken