https://arstechnica.com/gadgets/2017/10/google-is-investigating-reports-of-pixel-2-xl-display-burn-in/

The Pixel 2 and Pixel 2 XL are the best Android phones you can buy, but boy does the 2 XL have a lot of display issues. In addition to graininess and a weird blue shift at certain viewing angles, the 2 XL is now experiencing burn-in on units that are just a week or two old.

Android Central was the first to report the issue, showing a picture of a Pixel 2 XL with some nasty image retention around the navigation bar. Shortly after, several other reports of burn-in started popping up, and you can add Ars' review unit to the list of affected devices. You can see the permanent navigation bar burn-in below on our two-week old device.