Having same issue. Here’s a video of trying to draw vertical strokes with finger in Paper app. As you can see, several first dont register properly (they are supossed to run from top to bottom as the rest). And then one of the later strokes also fails to register correctly: https://youtu.be/Ra03hpG4X5g btw currently I’m running latest ios 12.2 beta 6, and the issue persists.
I’ve destroyed components on logic board during this step as my pry tool tocuhed the board when prying. Now the phone won’t charge. Be extra careful.