...
It has come to our attention that our current supplier for map tiles (Skobbler) is ceasing to exist, therefore certain map tiles are currently missing from the maps in the dashboard. We are replacing Skobbler with Thunderforest (as standard) in our next release, however in the interim, customers can make a change to the Dashboard System Variables now to take advantage of Thunderforest already.
Solution
Replace the URL for MAP_TILE_URL to be https://tile.thunderforest.com/atlas/{z}/{x}/{y}.png?apikey=84452deb15d84fcaa8ad4986f7ef8ca4
...
https://tile.thunderforest.com/atlas/{z}/{x}/{y}.png?apikey=84452deb15d84fcaa8ad4986f7ef8ca4