https://www.cnet.com/news/pixel-3-xl-displays-a-second-notch-bug-google-fix-coming-soon/

Google confirmed that a fix for it is coming soon, but gave no official explanation. The bug may have something to do with switching the phone's screen orientation from vertical to landscape, the second notch reportedly disappearing after a fresh restart.

Aside from the strange looking dual-notch bug, the Pixel 3 XL (and its smaller Pixel 3 counterpart) is still an excellent phone. Although it does't have expandable memory, it has a top-of-the-line camera, a water-resistant design and can screen spam calls with its built-in Google Assistant software.