Following the news that the latest iOS update can break phones with non-official replacement screens, repairers are encountering a different, more subtle problem: If you put a genuine Apple replacement display into an iPhone 8, 8 Plus or X, it’ll no longer be able to adjust its brightness automatically. If Apple or one of its authorized partners were to put the same display in the same phone, though? No problem.
Source: Even genuine replacement Apple displays can mess with iPhones