MySQL 8.0.39 Grant problem.
A user with all privileges wasn't able to update a Procedure, got error below.
ERROR 1227: Access denied; you need (at least one of) the SYSTEM_USER privilege(s) for this operation.
We fixed it by running
GRANT SYSTEM_USER ON *.* TO 'userWithProblem';
Still connected as user 'userWithProblem'