CRM_Event_Form_Registration_ParticipantConfirm doesn't call preProcess or postProcess hooks.

It seems that the CRM_Event_Form_Registration_ParticipantConfirm-form and perhaps some other forms do not execute any hooks.

CRM_Event_Form_Registration_ParticipantConfirm doesn't execute them explicitly and doesn't call any parent methods.

How to reproduce:
I've simply hacked module_invoke_all from drupal to var_dump all hooks that are executed. When navigating to /civicrm/event/confirm there is not a single civicrm_* hook in the list of invoked hooks. A simple implementation of hook_civicrm_postProcess()

also is not invoked.