Your classes show their teacher again instead of saying "Unassigned".
Classes were showing "Unassigned" on the Classes page even when a teacher had been chosen. The teacher was always saved correctly, so nothing needs re-entering. Every affected class now shows the teacher it already had, new classes keep showing theirs, and renaming a teacher updates their classes straight away.
Electives are unchanged. They keep showing the instructor you typed in when you set them up.