Yes, normal key is a key down event when pressed and key up event when released.
Copilot key has different functionality AFAIK on different laptops / keyboards. It will fire several key down events followed by release events. When you let go it will not give any events.
Shortly, yes it behaves like a key combo pressed and released in some order.
Thus, there are several lengthy articles for workarounds.
And it is not standard procedure, unfortunately.

Good for you! From what I hear the implementation and seemingly also key combo can vary. I read an article about someone using timers so that's all I can say about that. I'm staying away from anything with a copilot key so I don't have any experience myself.