urllink.generate的query参数问题

https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/url-link/urllink.generate.html

我的参数：{

"path": "",

"is\_expire": true,

"query": "ZnJvbU9wZW5pZD1vcXRPRjR0VEpEdWlPZnQtbHRkMGF5OVF0a1dRJmxpY2Vuc2VObz3psoFOUjNSNjkmdmluTm89TFZWREIxMkE0QkQzNzIzMDU=",

"expire\_interval": 1,

"expire\_type": 1

}

为什么会报【40212，参数query填写错误】的异常？