[totaltec]

There is a possibility that another module is also decorating this class, and it may come alphabetically after yours.

In this case you need to make your module depend on the other, and you do this via module dependencies in your main.php I believe.

Check the class that you are decorating in the run directory. It should be extending your class after deployment, or it could be that it is extending another, you can chase through which class depends on which by seeing how they reference each other in the run directory.