Microbit: Plot x y does not work when a sprite is on the screen

I have a program that aims to function like an etch-a-sketch. If you hit A, the X coordinate will change, and if you hit B the Y coordinate will change.

I use a sprite as the 'crosshair' and pressing A+B will plot a point at the current coordinate. The problem is whenever there's a sprite on the screen plot just doesn't work.

Using sprites will start the microbit game engine which will render the sprites and override any kind of animation you are trying to show. I would suggest you do all the drawing with sprites and the game engine.

This would mean that when you press A+B it would create a new sprite for the location. Any example of doing this is: