An exception thrown when setting Step.Outputs from json

[k-ahmedhm]

Describe the bug
I'm receiving this exception message when trying to use a Step with Outputs from json,
Here is my Json :

{
  "Id": "RandomNumberWorkflow",
  "Version": 1,
  "Steps": [
    {
      "Id": "GenerateRandomNumber",
      "StepType": "WorkflowCoreTestApp.GenerateRandomNumberStep, WorkflowCoreTestApp",
      "Outputs": {
        "GeneratedNumber": "GeneratedNumber"
      }
    }
  ]
}

Here is RandomNumberWorkflow code :

public class GenerateRandomNumberStep : StepBody
{
    public int GeneratedNumber { get; set; } = 0;

    public override ExecutionResult Run(IStepExecutionContext context)
    {
        var random = new Random();
        GeneratedNumber = random.Next(1, 100);  // Generate a random number between 1 and 100
        Console.WriteLine($"Generated number: {GeneratedNumber}");
        return ExecutionResult.Next();
    }
}

And here is the Exception Message :

System.ArgumentNullException: 'Value cannot be null. (Parameter 'indexer')'

And here is the StackTrace :

  at System.ArgumentNullException.Throw(String paramName)
   at System.ArgumentNullException.ThrowIfNull(Object argument, String paramName)
   at System.Linq.Expressions.Expression.ValidateIndexedProperty(Expression instance, PropertyInfo indexer, String paramName, ReadOnlyCollection`1& argList)
   at System.Linq.Expressions.Expression.Property(Expression instance, PropertyInfo indexer, Expression[] arguments)
   at WorkflowCore.Services.DefinitionStorage.DefinitionLoader.AttachDirectlyOutput(KeyValuePair`2 output, WorkflowStep step, Type dataType, LambdaExpression sourceExpr, ParameterExpression dataParameter)
   at WorkflowCore.Services.DefinitionStorage.DefinitionLoader.AttachOutputs(StepSourceV1 source, Type dataType, Type stepType, WorkflowStep step)
   at WorkflowCore.Services.DefinitionStorage.DefinitionLoader.ConvertSteps(ICollection`1 source, Type dataType)
   at WorkflowCore.Services.DefinitionStorage.DefinitionLoader.Convert(DefinitionSourceV1 source)
   at WorkflowCore.Services.DefinitionStorage.DefinitionLoader.LoadDefinition(String source, Func`2 deserializer)