Mock testing substitutions making the tree hang

[pepeRossRobotics]

Describe the bug
I am testing simple mock testing using the guide here and I am experiencing that my tree stops ticking once the tree gets to the substituted node.

The tree is loaded using XML and the substitution rules are loaded using a JSON file

How to Reproduce
This is my tree:

<root BTCPP_format="4">
    <BehaviorTree ID="MainTree">
        <Sequence>
            <PrintToConsole
                name="PrintToConsole"
                string="testing"
                prefix="pre sub"
                timestamp="false"
            />
            <Script name="script_1"  code=" next_inspection_point:='0' "/>

            <PrintToConsole
                name="PrintToConsole"
                string="testing"
                prefix="post sub"
                timestamp="false"
            />
            <Delay delay_msec="2000">
                <AlwaysSuccess/>
            </Delay>
        </Sequence>
    </BehaviorTree>
</root>

This is the part of the code that runs the tree:

void Mk4BehaviorTrees::execute(const std::shared_ptr<BtGoalHandle> goal_handle)
{
  RCLCPP_INFO(get_logger(), "Executing goal");
  const auto goal_details = goal_handle->get_goal();

  if (does_inspection_file_exist(goal_details->path)) {
    load_inspection(goal_details->path);
  } else {
    send_no_inspection_file(goal_handle, goal_details->path);
    return;
  }

  // This is called if the using_mock_nodes is set to true
  load_mock_nodes();


  start_time_ = get_clock()->now();
  while (rclcpp::ok()) {
    if (goal_handle->is_canceling()) {
      running_tree_->haltTree();
      cleanup_tree();
      send_goal_cancelled(goal_handle);
      is_tree_being_executed_ = false;
      return;
    }

    send_feedback(goal_handle);
    running_tree_->tickOnce();
    RCLCPP_INFO(get_logger(), "Ticking");
    running_tree_->sleep(std::chrono::milliseconds(100));
  }

  if (rclcpp::ok()) {
    cleanup_tree();
    send_goal_completed(goal_handle);
  }
}

Without the substitutions this is the trees output:

[component_container-1] [INFO] [1738660757.723056057] [behavior_trees_node]: 
[component_container-1] pre sub
[component_container-1] testing
[component_container-1] 
[component_container-1] [INFO] [1738660757.723304994] [behavior_trees_node]: 
[component_container-1] post sub
[component_container-1] testing
[component_container-1] 
[component_container-1] [INFO] [1738660757.723522637] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660757.824344850] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660757.925034097] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660758.025824578] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660758.126585792] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660758.227266241] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660758.327910303] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660758.428539384] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660758.529365846] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660758.633216384] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660758.733816826] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660758.834551317] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660758.935329955] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660759.036006334] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660759.136620944] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660759.237264127] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660759.337703341] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660759.438322202] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660759.539171086] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660759.639594343] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660759.723999631] [behavior_trees_node]: Ticking
[component_container-1] [INFO] [1738660759.824982967] [behavior_trees_node]: 
[component_container-1] pre sub
[component_container-1] testing
[component_container-1] 
[component_container-1] [INFO] [1738660759.825460732] [behavior_trees_node]: 
[component_container-1] post sub
[component_container-1] testing
[component_container-1] 

When loading the following substitution:

{
  "TestNodeConfigs": {
    "MyTest": {
      "return_status": "SUCCESS"
    }
  },

  "SubstitutionRules": {
    "script_1": "MyTest"
  }
}

The code output is:

[component_container-1] [INFO] [1738660946.246000910] [behavior_trees_node]: 
[component_container-1] pre sub
[component_container-1] testing
[component_container-1] 

And never prints the Ticking message.

Also the execution hangs so I cannot finish the process cleanly.

Any pointer how I could debug this?

[pepeRossRobotics]

Using a clean docker image with the most up to date packages solved this. sorry for the hassle