It doesn't matter if the commission is still payable to the old agent.

More importantly as a customer, avoid cancelling your old policy just because the agent is no longer contactable or no longer able to service you. Everything restarts when you cancel and get a new policy, the Waiting Period (up to 2 years incontestability clause), the cash value allocation (restart from 60% from yr1), the agent commission restarts (from year 1~6).

Your insurance contract is with the insurance company, not with the agent.