Yeah maybe it's because I'm always swapping from WASD from ZQSD (as I'm french but I often need the WASD commands), so maybe that was on my side actually :D
Just this image to show you how the bugged laser looked on my screen ;D I had up to three at some point and they didn't came off until I closed the game haha. But maybe you've fixed it on your end and that's why you don't see them :D