为什么生成的带参数二维码，用户扫码获取到的eventkey是null？

{ "expire_seconds": 604800,"action_name": "QR_SCENE", "action_info": {"scene": {"scene_id": 123}}}

二维码：https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=gQGK8DwAAAAAAAAAAS5odHRwOi8vd2VpeGluLnFxLmNvbS9xLzAyaEtrcEpnX1RlQ0YxMjREcDF3MXgAAgQE7Q9gAwSAOgkA