Emulator hangs indefinitely instead of throwing expected error

Using the LocalOrchestrationService, if I create an orchestration instance and allow it to finish, then try creating another instance using the same id, the call to `CreateOrchestrationInstanceAsync` ends up hanging indefinitely. The same code with the ServiceBusOrchestrationService plugged in instead throws the expected error message: "An orchestration with id 'x' already exists. It is in state Completed".

Interestingly, if I don't wait for the first instance to finish and start the second instance immediately, I see the expected error message using the LocalOrchestrationService: "An orchestration with id 'x' already exists. It is in state Pending".

Here's a gist of the code I used to create the issue: https://gist.github.com/maxnorth/a9a860f86425c4890e01f3deb9307b69

I'm using these nuget packages:
Microsoft.Azure.DurableFramework.Core: **2.4.1**
Microsoft.Azure.DurableFramework.Emulator: **2.2.5**

Start with LocalOrchestrationService and the CreateOrchestrationInstanceAsync entry point described in the issue. Reproduce the sequence from the linked gist, comparing a completed orchestration with a pending one and with ServiceBusOrchestrationService. Done means the completed-instance case returns the expected duplicate-id error instead of hanging.

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