An entity will remain active if it is disabled and deleted during a single cycle (assuming it was previously enabled and active). Obviously you're not supposed to disable and delete at the same time, but these things do happen sometimes.
Sure, but to avoid that you can refresh the entity after disable or delete action to solve it. But be careful, it should be used rare or it may become a bottleneck.
An entity will remain active if it is disabled and deleted during a single cycle (assuming it was previously enabled and active). Obviously you're not supposed to disable and delete at the same time, but these things do happen sometimes.