当数组大小超过250时，agm-marker ngfor会剪切图标

如何解决当数组大小超过250时，agm-marker ngfor会剪切图标

我正在尝试在地图上显示我的设备，并且由于某些奇怪的原因，当设备阵列大小超过250时，图标显得减半了。 以下是我的标记：

<div *ngFor="let dev of devices">
   <agm-polyline  [strokeColor]="'blue'" (click)="lineClick($even,line)">
       <ng-container *ngFor="let point of history.polylinesnap$ | async">
          <agm-polyline-point 
               [latitude]="point.Latitude" 
               [longitude]="point.Longitude"
               (lineClick)="lineClick($event,line)">
         </agm-polyline-point>
       </ng-container>
   </agm-polyline>
   <agm-marker #deviceMarker
            [latitude]="dev.Track.Latitude"
            [longitude]="dev.Track.Longitude"
            (markerClick)="focus(dev)"
            [iconUrl]="{url:icon(dev),scaledSize: {height: height,width: width}}">
   </agm-marker>     
   <div *ngFor="let fence of state.geoFence$ | async">
       <agm-circle #deviceFences
            [latitude]="fence.Latitude"
            [longitude]="fence.Longitude"
            [fillColor]="'blue'"
            [circleDraggable]="true"
            [editable]="true"
            (circleClick) = "circleClick($event,fence)"
            (radiusChange)="radiusChange($event,fence)"         
            [radius]="fence.Radius">
       </agm-circle>  
    </div> 
</div>  

这是我的初始化：

ngOnInit() {
    this.getUserLocation();
    this.stateDevice = this.state.device$
    .subscribe(data =>{
      this.devices = data;
      if(data.length>501) {
        this.height = 20;
        this.width = 25;
      }
      this.devices.forEach(device=>{
        device.Icon = this.icon(device);
      });
    });
  }

当数据超过250或执行过程中缺少某些内容时，agm-marker的行为是否会这样？

下面分别显示的图标分别是数组250和250plus，不胜感激。