Merge branch 'MDL-39487_24' of https://github.com/IOC/moodle into MOODLE_24_STABLE

mod/assign/locallib.php

@@ -3143,7 +3143,7 @@ class assign {
             return false;
         }
         $assign = clone $this->get_instance();
-        $assign->cmidnumber = $this->get_course_module()->id;
+        $assign->cmidnumber = $this->get_course_module()->idnumber;
 
         return assign_grade_item_update($assign, $gradebookgrade);
     }