Laser trace

Hello i have a question in UE5 i have a programme. in this programme a laser is supposed to cut a sheet of metal. The laser is supposed to trace what it has already cut. Unfortunately it does not do this. It only draws this track when I move it statically, i.e. the sheet moves over the laser head, but it only draws when the laser head moves over the sheet. Does anyone know how I can change this?

On picture 1 you can see what happens when I just start the programme

On picture 2 you can see what happens when I move the laser beam with the mouse