The security level is not issue type dependent, it's a project thing. Just changing issue type should have no effect because there's nothing to change.
You'll need to find or write a listener that can pick up "issue type change" and clear the security level if it spots incident moving to <other>
Listeners are things that react to events. They run outside the workflow. Workflows throw events, but so do some config actions, and actions on issues that are not part of the workflow.
The reason I said listener is that you need to capture all possible issue updates as it is possible to "edit" the issue type, as well as "move" the issue to another type. Those two events are "issue updated" and "issue moved", both of which are not workflow events!
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