Issue Description:

With CEP rule, there is an activation created by Timer expiration,
e.g.

this after[0s, 5s] $eventCreated

and then marshall the ksession.

Then unmarshall the ksession. fireAllRules doesn't fire the activation.

Reproducer : https://github.com/tkobayas/reproducers/blob/main/Ex-marshaller-temporal-8.42

Acceptance Criteria:

• Write a unit test and fix