For the moment, I set min zoom to 3. I don't know why when the zoom level is less than 3, it will load empty tiles. I can make sure this tile is not on earth. Maybe this is caused by #2 or #6.
If you have time, could please tell me more about your project ? Explain in detail... Not really want to see the whole document... You can contact me by QQ: 642945989.
For the moment, I set min zoom to 3. I don't know why when the zoom level is less than 3, it will load empty tiles. I can make sure this tile is not on earth. Maybe this is caused by #2 or #6.