Ex. When you have a keyboard key held down and enter an interface(inventory, chest) the leave with the key still held(or just started to hold it) when you are back in control of the player the key you are holding will not reflect on the game until you repress it.
Scenario: Holding W and Ctrl when leaving the players inventory.
Expected: The player should start sprinting and moving forward
Actual Result: The player is standing still and is not sprinting
XBOX ONE BETA - Responsiveness in this case was as expected when using a controller.
WINDOWS 10/ANDROID (CONTROLLER) - While the sensitivity seems to be fixed, a behavior where something like holding down a button like L or R would not cycle continuously through the hot bar slots and instead only press once.
MOUSE(ANDROID) - Up until this point it has been impossible to implement a mouse API. However in Android release 8(codename OREO) an API was added for all public app developers. Not a bug just pointing it out.
If you need a better explanation, I be happy to provide footage of some examples. Please take note of this as I believe that this is a critically overlooked feature to be ported from Java Edition.