While I think the original question may have been resolved by resetting the tile’s icon to default, I wanted to note that we’ve added support for custom icons and colors based on device state to the latest SharpTools.io beta. I’ve added you to the beta program and you can find details on the new feature in the following post in the private Beta Testers category:
https://community.sharptools.io/t/custom-icons-and-colors-based-on-states/2843?u=josh
For anyone else who is interested in joining the beta program, you can find more details on how to join the beta in the Beta Testers Requested! thread.