Push: System.InvalidOperationException: A second operation was started on this context instance before a previous operation completed

[ryxxxx]

Describe the bug

I am getting exceptions during a push: System.InvalidOperationException: A second operation was started on this context instance before a previous operation completed.

To Reproduce

Similarly to #377 I am not able to produce it with a minimal example, but the bug only occurs when PushOptions are given with ParallelOperations set to more than 1. First I thought that the issue might be related to the fact that in OperationsQueueManager.cs
_ = this._context.Update(operation);
is called inside a lock statement when resolution.Result is ConflictResolutionResult.Server and not when resolution.Result is ConflictResolutionResult.Client. But the exception is also sometimes thrown, when there are no conflicts being resolved, so I now think it might have to do with
object? oldValue = await this._context.FindAsync(entityType, [operation.ItemId], cancellationToken).ConfigureAwait(false);
which could cause concurrent DbContext operations as far as I understand the code? I haven't been able to debug the issue too well and am sticking to using ParallelOperations = 1 for now.

Expected behavior

No exception.

What platforms?

• Server:

  • Version of dotnet being used to compile? 10
  • Library versions? 10.0.0
  • What database are you using? Microsoft SQL Server
  • Where are you running the server? Azure

• Client:

  • What platform (Android, iOS, Windows, etc.) versions are you running on? Android
  • Does it happen in an emulator / simulator, or only on a real device? Only tested on real device
  • Version of dotnet being used to compile? 10
  • .NET Runtime Environment (WPF, UWP, WinUI3, MAUI, etc.): MAUI
  • Datsync Toolkit NuGet versions? 10.0.0

Screenshots

Additional context