Durable Entities keeps re-running task after successful completion

I have a long running task that needs to only have one instance running at a time. I chose Azure Durable Entities based on the documentation that these are designed for this sort of situation, but it seems that past a certain threshold the entity will re-run the task after execution has completed. It does the job of single threading the task beautifully, but never seems to recognize that it has completed.

Here is an example with the Sleep call representing the long running task execution:

```
[FunctionName("LongRunningTask")]
public static void LongRunningTask([EntityTrigger] IDurableEntityContext context, ILogger log)
{
var sleepTime = context.GetInput();
var state = context.GetState() ?? new LongRunningTaskState();
log.LogInformation($"Waiting for {sleepTime}... State when started: {JsonConvert.SerializeObject(state)}");
System.Threading.Thread.Sleep(sleepTime);
state.RunCount++;
context.SetState(state);
var updatedState = context.GetState() ?? new LongRunningTaskState();
log.LogInformation($"Finished waiting {sleepTime}. New state is {JsonConvert.SerializeObject(updatedState)}");
context.Return(state);
}

[FunctionName("StartLongRunningTask")]
public static async Task StartLongRunningTask(
[HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = "StartLongRunningTask/{seconds:int}")] HttpRequestMessage req,
int seconds,
[DurableClient] IDurableEntityClient starter,
ILogger log)
{
var delay = TimeSpan.FromSeconds(seconds);
var entityId = new EntityId(nameof(LongRunningTask), "Singleton");
await starter.SignalEntityAsync(entityId, "Download", operationInput: delay);
return (ActionResult)(new OkObjectResult($"Schedule task for {delay}"));
}
```

If I tell it to wait 30 seconds, it behaves as expected:

```
[2023-02-03T23:02:22.452Z] Executing 'StartLongRunningTask' (Reason='This function was programmatically called via the host APIs.', Id=542d8dad-58a2-47a1-94ac-5f5489a56d67)
[2023-02-03T23:02:22.514Z] @longrunningtask@Singleton: Function 'longrunningtask (Entity)' scheduled. Reason: EntitySignal:Download. IsReplay: False. State: Scheduled. HubName: TestHubName. AppName: . SlotName: . ExtensionVersion: 2.9.0. SequenceNumber: 2.
[2023-02-03T23:02:22.529Z] Executed 'StartLongRunningTask' (Succeeded, Id=542d8dad-58a2-47a1-94ac-5f5489a56d67, Duration=98ms)
[2023-02-03T23:02:22.660Z] Executing 'LongRunningTask' (Reason='(null)', Id=11e224a1-acc1-404e-b29f-7dd062e16e40)
[2023-02-03T23:02:22.666Z] @longrunningtask@Singleton: Function 'longrunningtask (Entity)' started. IsReplay: False. Input: (216 bytes). State: Started. HubName: TestHubName. AppName: . SlotName: . ExtensionVersion: 2.9.0. SequenceNumber: 3. TaskEventId: -1
[2023-02-03T23:02:22.676Z] Waiting for 00:00:30... State when started: {"runCount":1}
[2023-02-03T23:02:52.773Z] Finished waiting 00:00:30. New state is {"runCount":2}
[2023-02-03T23:02:52.777Z] @longrunningtask@Singleton: Function 'longrunningtask (Entity)' completed 'Download' operation 7470263c-de86-4243-84e5-eec14d489af0 in 30103.6145ms. IsReplay: False. Input: (216 bytes). Output: (56 bytes). HubName: TestHubName. AppName: . SlotName: . ExtensionVersion: 2.9.0. SequenceNumber: 4.
[2023-02-03T23:02:52.809Z] @longrunningtask@Singleton: Function 'longrunningtask (Entity)' completed. ContinuedAsNew: True. IsReplay: False. Output: (56 bytes). State: Completed. HubName: TestHubName. AppName: . SlotName: . ExtensionVersion: 2.9.0. SequenceNumber: 5. TaskEventId: -1
[2023-02-03T23:02:52.815Z] Executed 'LongRunningTask' (Succeeded, Id=11e224a1-acc1-404e-b29f-7dd062e16e40, Duration=30157ms)
```
But if I tell it to wait 10 minutes, it enters an endless loop where it doesn't recognize the successful completion of the previous iteration. Note the state at the beginning of each attempt stays at "runCount": 1:

```
[2023-02-03T22:29:41.355Z] Executing 'StartLongRunningTask' (Reason='This function was programmatically called via the host APIs.', Id=bd751b6f-71f8-4c1d-97ee-24b3027a6d85)
[2023-02-03T22:29:41.427Z] @longrunningtask@Singleton: Function 'longrunningtask (Entity)' scheduled. Reason: EntitySignal:Download. IsReplay: False. State: Scheduled. HubName: TestHubName. AppName: . SlotName: . ExtensionVersion: 2.9.0. SequenceNumber: 2.
[2023-02-03T22:29:41.453Z] Executed 'StartLongRunningTask' (Succeeded, Id=bd751b6f-71f8-4c1d-97ee-24b3027a6d85, Duration=124ms)
[2023-02-03T22:29:41.474Z] Executing 'LongRunningTask' (Reason='(null)', Id=bdbb65aa-ac65-4252-bab8-028974a81148)
[2023-02-03T22:29:41.481Z] @longrunningtask@Singleton: Function 'longrunningtask (Entity)' started. IsReplay: False. Input: (216 bytes). State: Started. HubName: TestHubName. AppName: . SlotName: . ExtensionVersion: 2.9.0. SequenceNumber: 3. TaskEventId: -1
[2023-02-03T22:29:41.500Z] Waiting for 00:10:00... State when started: {"runCount":1}
[2023-02-03T22:39:41.586Z] Finished waiting 00:10:00. New state is {"runCount":2}
[2023-02-03T22:39:41.592Z] @longrunningtask@Singleton: Function 'longrunningtask (Entity)' completed 'Download' operation 8a07b5fb-fa93-4ff5-9278-2b33eb125ea1 in 600097.4966ms. IsReplay: False. Input: (216 bytes). Output: (56 bytes). HubName: TestHubName. AppName: . SlotName: . ExtensionVersion: 2.9.0. SequenceNumber: 4.
[2023-02-03T22:39:41.616Z] @longrunningtask@Singleton: Function 'longrunningtask (Entity)' completed. ContinuedAsNew: True. IsReplay: False. Output: (56 bytes). State: Completed. HubName: TestHubName. AppName: . SlotName: . ExtensionVersion: 2.9.0. SequenceNumber: 5. TaskEventId: -1
[2023-02-03T22:39:41.619Z] Executed 'LongRunningTask' (Succeeded, Id=bdbb65aa-ac65-4252-bab8-028974a81148, Duration=600148ms)
[2023-02-03T22:39:41.653Z] Executing 'LongRunningTask' (Reason='(null)', Id=18e7056a-22e2-496f-8486-a7704791713e)
[2023-02-03T22:39:41.654Z] @longrunningtask@Singleton: Function 'longrunningtask (Entity)' started. IsReplay: False. Input: (216 bytes). State: Started. HubName: TestHubName. AppName: . SlotName: . ExtensionVersion: 2.9.0. SequenceNumber: 6. TaskEventId: -1
[2023-02-03T22:39:41.656Z] Waiting for 00:10:00... State when started: {"runCount":1}
[2023-02-03T22:49:42.466Z] Finished waiting 00:10:00. New state is {"runCount":2}
[2023-02-03T22:49:42.470Z] @longrunningtask@Singleton: Function 'longrunningtask (Entity)' completed 'Download' operation 4e08a7d2-a0bf-4d68-bc2a-eff989ef3007 in 600814.92ms. IsReplay: False. Input: (216 bytes). Output: (56 bytes). HubName: TestHubName. AppName: . SlotName: . ExtensionVersion: 2.9.0. SequenceNumber: 7.
[2023-02-03T22:49:42.473Z] @longrunningtask@Singleton: Function 'longrunningtask (Entity)' completed. ContinuedAsNew: True. IsReplay: False. Output: (56 bytes). State: Completed. HubName: TestHubName. AppName: . SlotName: . ExtensionVersion: 2.9.0. SequenceNumber: 8. TaskEventId: -1
[2023-02-03T22:49:42.475Z] Executed 'LongRunningTask' (Succeeded, Id=18e7056a-22e2-496f-8486-a7704791713e, Duration=600822ms)
[2023-02-03T22:49:42.502Z] Executing 'LongRunningTask' (Reason='(null)', Id=d57f3470-af6f-464a-9b14-8091e70946c2)
[2023-02-03T22:49:42.503Z] @longrunningtask@Singleton: Function 'longrunningtask (Entity)' started. IsReplay: False. Input: (216 bytes). State: Started. HubName: TestHubName. AppName: . SlotName: . ExtensionVersion: 2.9.0. SequenceNumber: 9. TaskEventId: -1
[2023-02-03T22:49:42.505Z] Waiting for 00:10:00... State when started: {"runCount":1}
[2023-02-03T22:59:42.567Z] Finished waiting 00:10:00. New state is {"runCount":2}
[2023-02-03T22:59:42.570Z] @longrunningtask@Singleton: Function 'longrunningtask (Entity)' completed 'Download' operation 8a07b5fb-fa93-4ff5-9278-2b33eb125ea1 in 600065.2645ms. IsReplay: False. Input: (216 bytes). Output: (56 bytes). HubName: TestHubName. AppName: . SlotName: . ExtensionVersion: 2.9.0. SequenceNumber: 10.
[2023-02-03T22:59:42.571Z] @longrunningtask@Singleton: Function 'longrunningtask (Entity)' completed. ContinuedAsNew: True. IsReplay: False. Output: (56 bytes). State: Completed. HubName: TestHubName. AppName: . SlotName: . ExtensionVersion: 2.9.0. SequenceNumber: 11. TaskEventId: -1
[2023-02-03T22:59:42.572Z] Executed 'LongRunningTask' (Succeeded, Id=d57f3470-af6f-464a-9b14-8091e70946c2, Duration=600070ms)
[2023-02-03T22:59:42.594Z] Executing 'LongRunningTask' (Reason='(null)', Id=94e639a1-c460-494e-b48c-3215253acf6f)
[2023-02-03T22:59:42.595Z] @longrunningtask@Singleton: Function 'longrunningtask (Entity)' started. IsReplay: False. Input: (216 bytes). State: Started. HubName: TestHubName. AppName: . SlotName: . ExtensionVersion: 2.9.0. SequenceNumber: 12. TaskEventId: -1
[2023-02-03T22:59:42.596Z] Waiting for 00:10:00... State when started: {"runCount":1}
```

I have the function timeout set to 4 hours in my host.json file and a premium app service plan that allows for longer running functions.