ConvexPolyhedron isn't working for certain vertices

[Gartenimperator]

When i create a convexPolyhedron with the values:

let vertices: CANNON.Vec3[] = [
            new CANNON.Vec3(1.6914, 0.524775, 1.102675), // 1
            new CANNON.Vec3(1.7181, 0.581274, 2.075575), // 2
            new CANNON.Vec3(-4.1381, -1.222925, -4.314225), // 3
            new CANNON.Vec3(0.7285, 0.116874, 1.135975), // 4
        ];

let faces = [
[2, 1, 0],
[3, 1, 2],
[3, 0, 1],
[3, 2, 0]];

let chassisShapeComplex = new CANNON.ConvexPolyhedron({
            vertices: body,
            faces: facesNotTriangulized
        });

let chassisBody = new CANNON.Body({
            mass: this.bodyMass,
            position: new CANNON.Vec3(0, 10, 0), //cars spawn 10 meters in the air.
            material: bodyMaterial,
            collisionFilterGroup: 1,
            collisionFilterMask: 2 | 4
        });

chassisBody.addShape(chassisShapeComplex);

let trackStart = new CANNON.Body({
            mass: 0, // mass = 0 makes the body static
            material: this.groundMaterial,
            shape: new CANNON.Box(new CANNON.Vec3(10, 1, 50)),
            position: new CANNON.Vec3(0,-10,2),
            collisionFilterGroup: 2,
            collisionFilterMask: 1
        });

(rough copy paste of my code)
and drop it onto a static Box (under normal gravity 0, -9.82, 0) (here 'trackStart'), the collision isn't calculated correctly and the convexPolyhedron glitches into the box. It works if i create a compound body out of the 4 triangle faces!
I for the life of me couldn't make a jsFiddle with three.js and cannon.js working, so I hope you can reproduce the bug with this much.
I can also supply the whole project im working (on with the bug), if needed.
I'd be very grateful if someone could share some ideas, as to whats going wrong.