During the early part of my time instructing on the Bulldog, it was normal to leave the parachute in the aircraft after landing, which meant routinely undoing the seat harness, then the chute QRB, before climbing out.
We were required to carry out an abandonment drill once a month, when we practiced climbing out taking the chute with us. After a fatal accident involving another QFI who fell out of his parachute harness after abandoning his spinning Bulldog, I decided that every time I climbed out of my aircraft, I would take my chute with me and then put it back in the aircraft for the next occupant. It was likely that he inadvertently unlocked his chute harness as well as the seat harness, so force of habit rather than emergency training took over.