[MC-175603] I can't use the keyboard and mouse at the same time. I can't walk and move the camera at the same time

I installed the game and went to test it, there was this little problem that interferes with the gameplay.

Linked issues

violine1101 2020-03-21T21:45:04Z

What kind of mouse do you use? If you use another mouse, does the issue still persist or does it go away?

Some keyboards with built-in touchpad will do this. (And not just MC. Also a problem with other applications)