I should have said, I didn’t just eyeball it, I copied a screenshot into an image editor to check. (I used that same technique for my game to find places where I accidentally used more colors.) One example is the gun in the lower right has shades of gray. I can post a screenshot later.
Edit: https://imgur.com/a/nRyfdDu It's even in the dithered part. I used the Win+Shift+S tool that's built in to Windows to screenshot the game, which I don't believe adds any extra AA to the image but I could be wrong. Does the game have a built in screenshotting feature?