Pressing the GetKeyDown(KeyCode.LeftShift) button does not always work, what should I do?

Question

Unity

if(Input.GetKeyDown(KeyCode.LeftShift)){
            controll_changed=!controll_changed;
        }

Sometimes it activates the first time, but usually you need to poke it several times to work. This is confusing.

Answer 1

Don't use it in FixedUpdate