To reproduce this bug:

1.Open the attached project
2.Open "Scene".
3.In the Hierarchy, select the "Button" object.
4.Make sure you have an Animator window open to watch the state transitions of the Button.
5.Press "Play" to start the scene.
6.In the Inspector, scroll down to the "NewBehaviourScript" component.
7.Toggle the "Interactable" checkbox on the NewBehaviourScript on and off multiple times.
8.Notice how when the checkbox is checked, the Animator (and Button) is in the Disabled state. Also notice how when the checkbox is unchecked, the Animator is in the Normal state.
9.Also notice how the "Button" component's "Interactable" checkbox appears to be the same as the NewBehaviourScript's checkbox.
10.If you disable the NewBehaviourScript component, and then toggle just the Button's "Interactable" checkbox, you'll notice it performs correctly.
11. Additionally, if you hover over the button after toggling the NewBehaviour script “interactable" property, that seems to trigger the button to update its transition state to the correct state