Some iPhone 15 Pro Max units are suffering from a serious screen defect،
A pretty serious case of screen burn on an iPhone 15 Pro Max
Burn-in often begins with image retention. This is a ghost image showing a previous screen that will disappear over time. So, if you have image retention on your iPhone, turn off the device before it turns into a case of permanent burn-in. Certain applications that remain static for a long period of time or whose screen elements do not change, such as Google Maps for example, are prime candidates for contributing to screen burn-in.
Yet another case of screen burn-in on an iPhone 15 Pro Max
Even so, screen burn-in takes a long time, which means that the iPhone 15 Pro Max Screens exhibiting this problem could suffer from a manufacturing defect. Either way, Apple should replace the phone because it’s a hardware issue and a software update won’t help. There is a one year warranty on new iPhone 15 Pro Max units, so if your phone is burned, you can visit the Genius Bar at your nearby Apple Store. You can also call the nearest Apple Store and explain the problem.