当把被拖放元素放在group（将group当做整体拖放）拖到目标元素上时，目标元素监听拖放事件时灵时不灵

[1093439315]

如下代码。我将testBox 放在testBoxGroup 中，然后设置testBoxGroup 允许拖放，我尝试将testBoxGroup 拖放到group stage元素中，由stage元素监听拖放事件并打印日志，发现这个事件时灵时不灵的，有时候触发有时候不触发。但是我空拖则稳定触发。

// #监听单个事件
import {Box, DragEvent, DropEvent, Ellipse, Group, Leafer, PointerEvent, Rect} from "leafer";

const leafer = new Leafer({ view: window })

const testBox = new Rect({
    x: 100, y: 100,
    width: 30,
    height: 20,
    fill: {
      type: 'linear',
      stops: [
        {offset: 0, color: '#606060'},
        {offset: 0.5, color: '#B0B0B0'},
        {offset: 1, color: '#606060'}
      ]
    },
    strokeWidth: 1,
    stroke: '#1B1B1B'
  });

  const testBoxGroup = new Group({
    draggable: true,
    children: [testBox]
  })

  const innerBox = new Ellipse({
    width: 80,
    height: 80,
    fill: 'black',
    stroke: 'none'
  })

  const stage = new Group({
    children: [innerBox]
  })
  stage.on(DropEvent.DROP, () => {
    console.log("Drop");
  })
  stage.on(DragEvent.ENTER, () => {
    console.log('Enter')
  })
  stage.on(DragEvent.LEAVE, () => {
    console.log('LEAVE')
  })

  const box = new Box({
    width: 100,
    height: 100,
    fill: 'red',
    children: [stage]
  })
  box.on(PointerEvent.TAP, () => {
    console.log("Pointer");
  })
  const group = new Group({
    children: [box]
  }) 
  leafer.add(group)
  leafer.add(testBoxGroup)

[leaferjs]

收到，我到时看看原因