Touch screen taps are sometimes missed after some idle time. For example, the first letter typed in a sentence. Its like the screen uses the first tap just to wake up and only then start registering letters. It happens all over the os, not just the keyboard. My phone is Xiaomi Mi A2 Lite and the problem started recently, but im not sure if it was just after the update to android 10 or a day later when I got a screen replaced.