I installed OOTP 18 for the first time yesterday and immediately noticed an issue with the app icon when it's in the dock...
Once I'd seen this I couldn't un-see it, so decided to fix it.
If you're running the game on macOS and want to fix it too, follow these steps...
1. Download the updated icon here
Icon.zip
2. Open ~/Library/Application Support/Steam/steamapps/common/Out of the Park Baseball 18/ in Finder
3. Right-click on OOTP Baseball 18.app and choose Get Info
4. Drag OOTP.icns from the zip onto the icon in the top-right of the info panel...
You may need to restart OOTP to notice the changes if it's already running, but you can see here that it looks much better...