Unchecking a role name doesn't enable the save button

If you previously saved a custom button with roles:

If you remove one or more of them, the save button isn't enabled despite the change

Note, if you check a role name, the save button is enabled. It's a bug when you try to disable the role by unchecking it.

Editing a custom button, attribute/value pairs, don't properly disable the save button

If you add the attribute/value pairs, the save button is enabled:

If you now remove them without saving, the save button is still enabled, even though I have no changes: