Guys!
Take a look at this topic!
Does the bug you are referring in this post have something to do with the one i am highlighting in my post?
In short:
From time to time i find a bug where i create a placeholder button and then i create multiple instances of it and change the icon of each instance.
The bug happens when after hover the icon color remains as hover.
In my topic i also provide a file where you can see the bug, but also a clone copy of the same button with the same hieriarchy on EVERYTHING, but the copy does not have this problem.