Checkbox Bug

Hi everyone, I can’t manage to change the appearance of the checked checkbox.
I loaded an image but I still get the default check instead of it. As you can see in the attached picture, the “unchecked hovered” and “checked hovered” have the same setup but I get different results.

In UE 4.26 this kind of setup worked fine.
Any help? I don’t want to switch visibility on 2 different buttons, it’s a messy solution.

Thanks!