The update in 14.3 to vector-based maps for GeoGraphics and GeoListPlot has broken the GeoServer directive in that it now responds with "GeoServer::styleres: Cannot download vector style resources.” and returns a blank map.
GeoGraphics
GeoListPlot
GeoServer
GeoServer -> \ "https://vector.openstreetmap.org/shortbread_v1/`1`/`2`/`3`.mvt"
It seems that the GeoServer works as expected for raster maps:
GeoGraphics[Entity["Country", "Ireland"], GeoServer -> "http://a.tile.openstreetmap.org/`1`/`2`/`3`.png"]
The ability to import vector maps may come later?
