Hi Alexander,
I moved to new version 26.5 and here my results:
Please see:
Test data(input/output/QGIS)
5380 Gml TopoJson.zip (54.8 KB)
Thanks,...com/gis/net/convert-gml-to-topojson/ GeometryTransformati...https://docs.aspose.com/gis/net/transform-geometries/ If you...