底图缓存问题

加载过的卫星底图好像没有进行缓存或者缓存失败，导致地图在缩放或者拖动的时候会一直出现白底的情况

类似下图这种情况，这是截图的一段视频，我在同一个位置不停缩放，加载过的图片会一直重新加载导致一直出现白底

The report concerns satellite basemap images repeatedly reloading during zooming or panning, leaving a white map area, but it names no files, tests, or entry points. Start by reproducing the behavior at one location while zooming and dragging, then trace the basemap tile-loading and caching path. Done means previously loaded imagery is reused and the white gaps no longer recur during these interactions.

Written by the indexing model from the issue text.