From GitHub: https://github.com/Unity-Technologies/InputSystem/issues/408

Repro:
1. Download package and project: https://github.com/Unity-Technologies/InputSystem
2. Open Input Debugger at Window -> Input Debugger
3. Open Keyboard under Devices
4. Type in keyboard and observe the Events

Actual: Some events are out of order or disappear

Note: this happens to mouse and other devices as well, but easier to see with keyboard.