微信小程序 手机号授权登录 偶尔后端解密失败

微信小程序wx.login获取code要在手机号授权前触发

<button
			:id="code"
			:open-type="hasGetPrivacySetting ? 'getPhoneNumber|agreePrivacyAuthorization' : 'getPhoneNumber'"
			@getphonenumber="onGetPhoneNumber"
			class="btn"
			@click="clickPhoneNumber"
		>
		</button>

点击按钮是先触发 clickGetCode

async clickGetCode() {
			  this.wxCode = await this.getCode()
			  console.log('this.wxCode', this.wxCode)
			},
			getCode() {
			  return new Promise((resolve, reject) => {
			    uni.login({
			      provider: 'weixin',
			      success: res => {
			        resolve(res.code)
			      },
			      fail: reject
			    })
			  })
			},

手机号授权后再将code和手机号加密串一起给后端

			async onGetPhoneNumber(e) {
				// const code = await this.getCode()
				console.log('onGetPhoneNumber', e)
			    let that = this
			

			    if (e.detail.errMsg == "getPhoneNumber:ok") {
					loginMpWxMobile({
						form: {
						  code: that.wxCode,
						  encryptedData: e.detail.encryptedData,
						  isParty: true,
						  iv: e.detail.iv,
						  refereeId: 0
						}
					}).then(res => {
						
					})
			    } else {
					console.log('error', e)
			        wx.showToast({
			            title: "授权手机号失败",
			            icon: "none",
			        });
			    }
			
			},