This idea has been merged into another idea. To comment or vote on this idea, please visit PROD-I-83 Allow for teachers to "deselect" student from assignment/assessment if absent from class.
This feature is similar to the one that Google Classroom has. The student will see the assessment when he/she is ready to take it, and not when the rest of the class is. Especially if the student is absent, but is able to log on the day of the assessment.