OpenCart 4 events not firing for catalog model and controller triggers even though event rows exist

I am working on an OpenCart 4 extension that needs to listen for cart events, such as:

catalog/model/checkout/cart|add/after catalog/model/checkout/cart|update/after catalog/model/checkout/cart|remove/after

The events are successfully created in oc_event during installation and appear with the correct trigger and action values. The action points to:

extension/reloadify/module/cart_activity_events|onCartAddAfter

However, the event handler never fires. There is no logging, no controller execution and no errors. The cart model debug logs show that the add/update/remove functions run, but OpenCart never loads my controller for the event.

I already confirmed the following:

The action route resolves without errors when accessed manually

Cache cleared, modifications refreshed and extension reinstalled

Class and file names follow OpenCart 4 conventions

The event status is set to 1

The file exists in catalog/controller/extension/reloadify/module/

Yet OpenCart never calls the controller during any event trigger.

Question:
What are the correct requirements for OpenCart 4 to load a catalog controller for event actions, and what would prevent an event action from firing even when the event row exists and the trigger runs?