I think the problem is a window problem. Whenever I alt tab on the latest release my mouse is right where my crosshair is facing, always in the middle of the screen. However, on every previous version when I alt tab, the mouse positions itself to the top left of my screen. I have tried numerous times through the actual game itself to put it in fullscreen and through the launcher.  On 1.16 my mouse is totally fine, no mouse acceleration, versions beside that screw up my mouse and actually make my sensitivity lower and make it accelerate when I move my mouse really fast in a direction.  The problem most likely arises to me have mouse acceleration turned on in mouse settings on windows 10, however on other games, the full screen prevents windows from using the mouse accerlation.

(I do not have java installed, however I have tried installing it and it does not fix the issue)