Trying to edit the Dark Gray Canvas for a custom basemap that does not have buildings...
I successfully saved the new tile layer, but upon inspection there is a sliver cut out of the [land] layer at zoom level 10:
Look just SW of the Pocomoke City label
Here is level 9:
And level 11:
The same gap in the basemap shows up on other styles, such as World Street Map (night) and Light Gray Canvas.
I believe there is an issue with the cache for [land] at level 10.