I had working calculated questions. After some Moodle upgrades (now we have version 3.3) when I want to save the question again, I get error https://docs.moodle.org/34/en/error/moodle/dmlreadexception.
It seems that the database of wildcards is gone and I have to restore the question manually by opening new one and copying question elements (items) there.
Upon creating new calculated question - by copying the old one into new - I am getting the same error of dmlreadexception.
Also, when I did copy of the existing old Quiz (with calculated questions) in the course, this opens new question category which I can not delete.
Any help, please ?