Bug Is it possible to create a UI button prefab?

When I enter in prefab mode I'm not able to drag and drop a game object from the inspector to assign it to the event OnClick of the button.
I presume is not possible to create a UI button prefab. And that can be a major bug by design.

Environment Unity 2019 and Unity 2020.2
Related: https://answers.unity.com/questions/1016222/enable-ui-button-from-prefab.html

 

@AlanMattano

"When I enter in prefab mode I'm not able to drag and drop a game object from the inspector to assign it to the event OnClick of the button."

Do you mean you can't drag some object from scene or from prefab itself to some field in prefab?

You can drag any of prefab's component just fine to button component's onClick...?

But you can not link scene content to prefabs. This works the same way for all the assets...

 

Yes
Yes
Yes
Bug by design. Using U2018, 2017, Unity5 4 Prefab system was fine.
Is more noticeable in a UI button. how do you connect it?
Is it possible to make a UI button Prefab?

If so is a major bug by design.

 

@AlanMattano

I use UI prefabs all the time. You simply can't refer to scene objects.

 

So the new Prefab system became now so complex that I can't make a button?
To make my Ui button work, I end up unpacking the prefab completely and not using a prefab.

How do you link to the prefab UI button event a script if you can't drag and drop it?

 

Scriptable Object can be the answer?