[BUG]Finished executing Fork with asynchronous activities unexpectedly

[iio888]

Description

To execute activities of Fork in parallel, I marked activities as Task and set RunAsynchronous to be true. But the workflow contains the fork finished with Suspended status unexpectedly and didn’t execute any activity in Fork.

Steps to Reproduce

1. Sample Code:

Sequence seq = new()
{
  Activities = {
    new Fork()
    {
      Branches = 
      {
        new Do(c => 
        {
          Thread.Sleep(1000);
          Console.WriteLine(“13”);
        }) { RunAsynchronously = true },

        new Do(c => 
        {
          Console.WriteLine(“11”);
          Thread.Sleep(2000);
          Console.WriteLine(“15”);
        }) { RunAsynchronously = true },
                
        new Do(c => 
        {
          Thread.Sleep(100);
          Console.WriteLine(“12”);
        }) { RunAsynchronously = true },
      }
    },
    new Do(c => Console.WriteLine(“2”),
  }
};

var services = new ServiceCollection();
var provider = services.BuildServiceProvider();
var runner = provider.GetRequiredService<IWorkflowRunner>();

var r = await runner.RunAsync(seq);

[Activity(“Elsa”, Kind = ActivityKind.Task)]
public class Do : Inline
{
  public Do(Action<ActivityExecutionContext> action)
    : base(action) 
  {  }
}

Expected Behavior

The workflow was supposed to execute activities of ‘Fork` in parallel.

Actual Behavior

None of activities in Fork are executed. The workflow contains the Sequence ran into Suspended status and met 3 bookmarks which are related to 3 activities in Fork.

Environment

• Elsa Package Version: 3.1.3
• Operating System: Windows 10

Log Output

Include any relevant log output or error messages that might help diagnose the issue.

Related Issues

Also, Can Fork finish after its activities executed in parallel which looks like Task.WaitAll() or Task.WaitAny()?