Determine if task exists and add dependency

I’m trying to write a custom action that adds tasks and creates dependencies based on whether tasks with a certain name exist.

Task name

• Produce
• Review (depends on Produce)
• Get Approval (Depends on Review)
• Schedule (Depends on Get Approval)

I would like the action to add a similar group of tasks and utilize one that already exists like so:

Task name

• Produce
• Review (depends on Produce just added)
• Schedule (Depends on EXISTING Get Approval)

I’ve set this to run on $WorkItems and filter related items using In(TargetObject.Name,"Approval").  If true, a new Dependency object is created.  Everything works up to that point, the new tasks are created, the dependency is created between the new sub-tasks,  (Produce and Review), but the dependency between the new Review task and the existing Get Approval task isn’t being created.