It seems that if a course shortname is very long and ends in a special character then the restore fails. Have you had this issue? Couldn't find from the tracker with a quick search, there was a regression bug but it was already in the backup process, our backup worked fine but the restore fails. Tested with 3.4, 3.5 and 3.6.
General developer forum
Long course shortname ending in a special character might cause problems?
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