Failed to create a compound shape

[8Observer8]

I want to create a compound shape with two circles. But I cannot to set a relative position of the top circle. This line does not do anything:

playerTopShape.Set(new b2Vec2(0, 20 / ppm), 20 / ppm);

Result:

A minimum example that demonstrate this problem in pure WebGL 1.0 + glMatrix:

• Playground: https://plnkr.co/edit/QB29hXNup1X7iQLK
• GitHub repo: https://github.com/8Observer8/complex-shape-box2dcore-webgl-js

    playerBody = world.CreateBody({
        type: b2BodyType.b2_dynamicBody,
        position: { x: 0.1 / ppm, y: 120 / ppm },
        angle: 0
    });
    playerBody.SetFixedRotation(true);

    const playerBottomShape = new b2CircleShape(20 / ppm);
    const playerBottomFixture = playerBody.CreateFixture({
        shape: playerBottomShape,
        density: 1
    });
    playerBottomFixture.SetRestitution(0);
    playerBottomFixture.SetFriction(2);

    const playerTopShape = new b2CircleShape();
    playerTopShape.Set(new b2Vec2(0, 20 / ppm), 20 / ppm);
    const playerTopFixture = playerBody.CreateFixture({
        shape: playerTopShape,
        density: 1
    });
    playerTopFixture.SetRestitution(0);
    playerTopFixture.SetFriction(0);

[8Observer8]

Of course the original C++ version of Box2D v2.4.2 works without the problem above. WASM-demo with WAD movement: https://complex-shape-box2dv2-opengl-sdl3-cpp.netlify.app/