https://wccftech.com/android-8-1-multi-touch-broken/

Google had its fair share of software issues with the Pixel 2 lineup. But now it seems like the company got to deal with some bugs in the Android 8.1 Oreo. According to posts from various users on the Pixel User Community, Android 8.1 Oreo is causing issues in the multi-touch feature. Several users reported that the update broke multi-touch on their devices.

Users have reported that after updating their phone to Android 8.1, touching screen with multiple fingers causes the image on some units shake and jump. This issue becomes even more annoying when playing games or trying to zoom the image by using the pinch to zoom gesture.