The "Assignment_extensions" placeholder will be replaced with a list of assignments that meet the specified conditions:
Only assignments from the same course as the instance will be included.
Only assignments that have not been completed by the student will be listed.
Only assignments where the submission deadline was extended will be displayed.
The format of the assignment extensions list will be as follows:
AssignmentTitle1:NewDeadline1(previously:DefaultDeadline1)
Assignment_Extensions: Provides information about assignment extensions.
Assignment_Feedback: Represents the feedback of the assignment.
Assignment_Grade: Represents the grade of the assignment.