I’ve been having this issue for a few months. Initially I couldn’t figure out what was going on but have observed it now for a while, I can confidently say that often when I unlock my iPhone X with FaceID, immediately after I get fantom keyboard keys appearing on the screen. What happens is, I unlock and then tap on an app icon to open it. Instead of opening the app, I get, for a momentary flash, a keyboard key displayed on screen. It is too quick to see exactly, but I assume it is the key corresponding with that position IF the keyboard was being shown. It only happens for a second or so after unlocking and even then, not every time, which makes it really hard to capture it. I therefore don’t have any screenshots to illustrate. Has anyone else experienced this? I’m mildly concerned it is some kind of malware / key logger.