使用官方demo稍微改了下，就复现了。

启动页面设置成grid-demo-1/index。

代码片段：https://developers.weixin.qq.com/s/NcOg4lmh7CQG

<scroll-view scroll-y style="width: 100%; height: 100%;" type="custom">
  <grid-view type="masonry" cross-axis-count="{{crossAxisCount}}" cross-axis-gap="{{crossAxisGap}}" main-axis-gap="{{mainAxisGap}}">
    <grid-tile wx:for="{{gridList}}" wx:key="id" index="{{item.id}}" height="{{100 * item.sub}}"></grid-tile>
  </grid-view>
  <grid-view wx:if="{{aaaa}}" type="masonry" cross-axis-count="{{crossAxisCount}}" cross-axis-gap="{{crossAxisGap}}" main-axis-gap="{{mainAxisGap}}">
    <grid-tile wx:for="{{gridList}}" wx:key="id" index="{{item.id}}" height="{{100 * item.sub}}"></grid-tile>
  </grid-view>
</scroll-view>

使用官方demo稍微改了下，就复现了。

// grid-demo-1/index.js
import { generateGridList } from '../utils'
Page({
  /**
   * 页面的初始数据
   */
  data: {
    aaaa: false,
    crossAxisCount: 2,
    crossAxisGap: 8,
    mainAxisGap: 10,
    gridList: generateGridList(10, 4),
  },


  /**
   * 生命周期函数--监听页面加载
   */
  onLoad(options) {
    setTimeout(() => {
        const gridList = this.data.gridList;
        this.setData({
            gridList: [...gridList,...generateGridList(10, 4)],
            aaaa: true,
        })
    }, 2000);
  },
})