VantWeapp datetime-picker Bug Report

test.js

// pages/test/test.js
Page({

  /**
   * 页面的初始数据
   */
  data: {
    currentDate: 1296576000000,
    maxDate: 1296576000000,
    minDate: 1259683200000,
    month: '201102',
    formatter (type, value) {
      if (type === 'year') {
        return `${value}年`
      } else if (type === 'month') {
        return `${value}月`
      }
      return value
    }
  },
  monthChange (e) {
    const t = new Date(e.detail)
    const y = t.getFullYear()
    let m = t.getMonth() + 1
    m = m < 10 ? `0${m}` : m
    const month = `${y}${m}`
    this.setData({ month })
    console.log(month)
  },
  monthMenuClose (e) {

  },
  onInput (event) {
    console.error('onInput', event)
    this.setData({
      currentDate: event.detail
    })
  }
})

test.json

{
  "navigationBarTitleText": "test",
  "usingComponents": {
    "van-datetime-picker":"@vant/weapp/datetime-picker"
  }
}

test.wxml

<view>
  <van-datetime-picker
    class="picker"
    value="{{currentDate}}"
    type="year-month"
    min-date="{{ minDate }}"
    max-date="{{ maxDate }}"
    formatter="{{formatter}}"
    bind:input="onInput"
    bind:cancel="monthMenuClose"
    bind:confirm="monthChange"
  />
</view>