It seems that the green tint isn’t a Samsung problem only. Some Apple users are starting to report a green tint on the displays in their iPhone 11, iPhone 11 Pro, and iPhone 11 Pro devices. It apparently appears randomly after unlocking their devices.
The guys over at MacRumors have spotted several reports at Reddit, of Apple customers that mention a green tint on the iPhone 11 models. In most cases, the displays turn green after unlocking their devices or when Dark Mode and Night Shift are activated. It is believed that this is a software issue since it started to show up after the iOS 13.5 update.
The green tint disappears after a while, but it comes back from time to time. Maybe this bug will go away with a future iOS update, but iPhone 11 users will have to wait, as Apple is currently testing iOS 13.5.5 beta.