Warning debug messages being displayed when sending notification emails after attempting a quiz

1. Set up a valid email for the Moodle instance in Site administration ► Plugins ► Message outputs ► Email
2. Set the Debug messages to DEVELOPER in "Site administration ► Development ► Debugging"
3. Create a course. Enrol students and teachers. Make sure the enrolled teachers have valid email addresses.
4. Create a quiz.
5. Under "Quiz administration", click "Permissions".
6. Select the "Teacher" role for the "Advanced role override" dropdown menu
7. Set the capability "mod/quiz:emailnotifysubmission" to "Allow" then click "Save changes".
8. Attempt the quiz as a student.
9. After submitting the quiz, the following debug messages will be shown:

   Necessary properties missing in userto object, fetching full record

   line 95 of /lib/messagelib.php: call to debugging()

   line 1451 of /mod/quiz/locallib.php: call to message_send()

   line 1531 of /mod/quiz/locallib.php: call to quiz_send_notification()

   line 1644 of /mod/quiz/locallib.php: call to quiz_send_notification_messages()

   line ? of unknownfile: call to quiz_attempt_submitted_handler()

   line 155 of /lib/classes/event/manager.php: call to call_user_func()

   line 89 of /lib/classes/event/manager.php: call to core\event\manager::process_buffers()

   line 2411 of /lib/dml/moodle_database.php: call to core\event\manager::database_transaction_commited()

   line 92 of /lib/dml/moodle_transaction.php: call to moodle_database->commit_delegated_transaction()

   line 184 of /mod/quiz/processattempt.php: call to moodle_transaction->allow_commit()

Upon investigation, the debug messages are being shown because the $eventdata->userto object that is being passed into the message_send function of lib/messagelib.php from the $recipient parameter in quiz_send_notification function of mod/quiz/locallib.php does not have the auth, suspended, deleted and emailstop properties.

These properties should be included in the $notifyfields variable of the quiz_send_notification_messages on line 1551 of mod/quiz/locallib.php.