Prevent blank tiles in World Imagery layer
There are several easy solutions to the World Imagery blank grey tile "Map data not yet available" bug. See:
https://developers.arcgis.com/rest/services-reference/map-tile.htm
and
https://github.com/openstreetmap/iD/issues/4327
... if ?blankTile=false is added to the tile request, a 404 is returned instead of the blank tile. Alternatively the HTTP response includes the header "blank-tile": "true" for missing tiles.
This should be enough to prevent the display of the grey "Map data not yet available" tiles.
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