Solved the problem with “customSeparateY”.
The solution of my case as it follows:
this.box2.body.customSeparateY = true; // this is upper box2
this.physics.add.collider(this.box1, this.box2, (box1, box2) => {
const b1 = box1.body;
const b2 = box2.body;
if (b1.y > b2.y) {
b2.y += (b1.top - b2.bottom);
b2.stop();
}
else {
b1.y += (b2.top - b1.bottom);
b1.stop();
}
});