Description

How to reproduce:

• create a helper and put in the project's lib: project/lib/helper/MyHelper.php that contains a function my_very_special_function()

  function my_very_special_function() {
    echo 'ok';
  }
  

• create a module with a settings.yml that include the helper: mymodule/config/settings.yml

  all:
    .settings:
      standard_helpers: [My]
  
  

• create a template that calls my_very_special_function()
• clear cache just in case and display it in dev mode.

Results: seing an error message: Fatal error: Call to undefined function my_very_special_function() in...

Expected Results: seing 'ok'