GitHub Transitions from Mapbox to Azure Maps
Not surprising at all. The impact of the change is marginal, maps aren’t exactly a core feature of GitHub.
As part of the transition, custom icons and formatting of features in geojson and topojson files will no longer be supported.
Not just icons and formatting, it seems GitHub chose the nuclear option. There are lines and polygons alongside points in this dataset, but only points are visible on the map. Plus, it doesn’t show anything in Safari.