How to ensure no orders are lost during temporary route changes for local delivery drivers?

Today, someone on the local delivery team took leave unexpectedly, so Driver A's route had to be split between Drivers B and C. My biggest fear is that exception notes follow the person rather than the order—things like gate codes, delivery windows, or cold-chain requirements often get lost during a route change. Instead of just assigning tasks verbally in the group chat, I reorganized the…