The uniapp packaging applet cannot display the bubbles on the callout coordinates

<map class="map" id="map1" ref="map1" 
		:style="[{'width':'100%'},{height:windowHeight-100+'px'}]" :enable-zoom="enableZoom" :scale="scale"
		:markers="covers1" :latitude="latitude" :longitude="longitude" @markertap="onmarkertap"></map>

After setting the markers coordinate points in the applet

covers1 = [{
            id: 0,
            latitude: 39.989631,
            longitude: 116.481018,
            title: '方恒国际 阜通东大街6号',
            zIndex: '1',
            rotate: 0,
            width: 20,
            height: 20,
            anchor: {
                x: 0.5,
                y: 1
            },
            callout: {
                content: '方恒国际 阜通东大街6号',
                color: '#00BFFF',
                fontSize: 10,
                borderRadius: 4,
                borderWidth: 1,
                borderColor: '#333300',
                bgColor: '#CCFF99',
                padding: '5',
                display: 'ALWAYS',
				textAlign: 'left'
            }
        }]

Clicking on the coordinates on the webpage can pop up the bubble content in the callout, but there is no response in the applet.
I couldn't find any useful method on the Internet to get it myself.

onmarkertap(e) {
				let _this = this;
				var pointList = _this.covers1;
				var id = e.detail.markerId;
				//‘BYCLICK’:点击显示; ‘ALWAYS’:常显
				var b = pointList.forEach((item) => {
				    if(item.id == id){//找到对应id
						if(item.callout.display == ''){
							item.callout.display = 'ALWAYS';
							return;
						}
						else if(item.callout.display == 'ALWAYS'){
							item.callout.display = '';
							return;
						}
					}
				})
			}

Just modify the display property directly when the coordinate point is clicked.