Weird after-image is created when moving fast, if you pay attention to the window. You can see a faint after image. This was fixed in game preview when I stopped using rigidbody for movement instead of translate, but when I build the game, the problem persisted.
Unity version: 2019.3.0f6
Here is a video that the problem is shown: (Sorry but you might need to look closely)
If the camera is fixed, then the player have an after image following him.