在场景中创建node1和node2两个小方块，然后贴以下代码，两个tween同时运行并且使用ease，效果就不对了，跟tween执行顺序有关，第二个会受第一个的影响，这算是BUG吗，还是我用法不对？
node1.setPosition(cc.v2(-500, 0));
node2.setPosition(cc.v2(500, 0));
let node1to = node2.convertToWorldSpaceAR(cc.v2()).sub(node1.convertToWorldSpaceAR(cc.v2()));
let node2to = node1.convertToWorldSpaceAR(cc.v2()).sub(node2.convertToWorldSpaceAR(cc.v2()));
let node1V2 = cc.v2(-100, 100);
let node2V2 = cc.v2(100, -100);
let ease = cc.easeBackIn();
cc.tween(node1).bezierBy(5, node1V2, node1V2, node1to, ease).start();
cc.tween(node2).bezierBy(5, node2V2, node2V2, node2to, ease).start();