I'm also having this issue. I have a group of teal icons that turn white on hover, and should turn grey after being visited. Instead, they are remain teal/white in normal/hover mode and do not show the visited state.
The same states and triggers work fine on the text below the icons, but not on the icons. If I disable the hover triggers, the visited state works. I even created a custom hover state, but the bug persists.
In my attached one-slide example, the computer icons have the hover state and the other two icon groups do not as proof of concept.
Please help!