canvas group breaks button

I have a large UI only project. I have an interactable area that has buttons, toggles, scroll bars, etc. My canvas group component basically stopped working when I add them to new objects. the old ones work.

I have a button that I place on top of everything that when clicked, resets a timer that controls a time out method.

When I add a canvas group to it and disable Blocks Raycasts, the button no longer functions and triggers the click event. I can interact with the ui elements below it, but it breaks.

Happens in 4.6.4, 4.6.5f, 5.0.1 basically any version I open the project in.

Thoughts?