When I use poly-decomp.js to decompose the matter.js body collider shape (tick 'Decompose' checkbox) the resulting body in matter.js has multiple sprites/textures - one per decomposed polygon.

https://codepen.io/joegaffey/pen/ExwNrEx

function addBody(x, y, points, scale, texture) {
  (decompCheck.checked) ? decomp = decompRef : decomp = null;
  let renderBody = {};
  if(imageCheck.checked)
    renderBody = {
      sprite: { 
        texture: texture,
        xScale: scale,
        yScale: scale
      }
    };
  const body = Matter.Bodies.fromVertices(x, y, points, { render: renderBody }, false);
  Matter.Body.scale(body, scale, scale);
  Matter.Composite.add(engine.world, [body]);
}