Reassigning a job used to show up in its Changes tab as "Team member 10002 → 10003". The history now names them, for example "Thabo Mokoena → Lerato Khumalo", and does the same for any other linked record, such as a customer or site.
A job made from a sales order, quote or invoice now has a first line saying who created it and from which document, so its history starts at the beginning.