【报Bug】map组件customCallout自定义气泡重新赋值失败。

示例代码：

<template>  
    <div>  
        <map name="map" id="map" class="map" :longitude="lng" :latitude="lat" :markers="markers">  
            <cover-view slot="callout">  
                <cover-view :marker-id="1" class="callout">  
                    <text>{{text}}</text>  
                </cover-view>  
            </cover-view>  

        </map>  
        <button @tap="change">修改cllout</button>  
    </div>  
</template>  

<script>  
    export default {  
        data(){  
            return{  
                lng:'115.86684363433837',  
                lat:'28.689214453586604',  
                markers:[{  
                    id:1,  
                    latitude:"28.689214453586604",  
                    longitude:'115.86684363433837',  
                    iconPath:'/static/logo.png',  
                    width:30,  
                    height:30,  
                    customCallout:{  
                        display:'ALWAYS',  
                        anchorX: 0,  
                        anchorY: 0,  
                    }  
                }],  
                text:'333'  
            }  
        },  
        methods:{  
            change(){  
                this.text="66666"  
            }  
        }  
    }  
</script>  

<style>  
    .map{  
        height: 500rpx;  
    }  
    .callout{  
        background-color: aqua;  
        width: 200rpx;  
        height: 50rpx;  
    }  
</style>

操作步骤：

<template>  
    <div>  
        <map name="map" id="map" class="map" :longitude="lng" :latitude="lat" :markers="markers">  
            <cover-view slot="callout">  
                <cover-view :marker-id="1" class="callout">  
                    <text>{{text}}</text>  
                </cover-view>  
            </cover-view>  

        </map>  
        <button @tap="change">修改cllout</button>  
    </div>  
</template>  

<script>  
    export default {  
        data(){  
            return{  
                lng:'115.86684363433837',  
                lat:'28.689214453586604',  
                markers:[{  
                    id:1,  
                    latitude:"28.689214453586604",  
                    longitude:'115.86684363433837',  
                    iconPath:'/static/logo.png',  
                    width:30,  
                    height:30,  
                    customCallout:{  
                        display:'ALWAYS',  
                        anchorX: 0,  
                        anchorY: 0,  
                    }  
                }],  
                text:'333'  
            }  
        },  
        methods:{  
            change(){  
                this.text="66666"  
            }  
        }  
    }  
</script>  

<style>  
    .map{  
        height: 500rpx;  
    }  
    .callout{  
        background-color: aqua;  
        width: 200rpx;  
        height: 50rpx;  
    }  
</style>

预期结果：

点击按钮重新赋值customCallout

实际结果：

赋值不成功