cancelled ejb timers persist in data/timer-service-data

I have a Singleton bean which creates a ejb.timer on deployment. Before doing so it cancels any existing timers previously created by the bean for completeness.

In wildfly 8 the cancelled timers were removed from data/timer-service-data/'bean'. In wildfly 9 CR2, they stay in data/timer-service-data/'bean' and appear to be re-instated on re-deployment