Dynamic Paint (displace mode) with particles Cubes object makes round spots

Hi fellow Blenderer !

As the title says, I have a problem with dynamic paint. I made a plane, with particles emitter on it. The particles are a simple cube (it will be the Brush). They are falling on an other plane (which is the Canva), and are supposed to make square holes in it when falling. But, for a reason i ignore, it makes round holes. I tried everything, nothing seems to work. Here are some screenshots of the scene :

When i use a normal Cube (so, not as particle), it works flawlessly. This problem only occure when the Brush are particles with a specific shape. Any idea how to fix this ?

Thanks :slight_smile: