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,...Bug 5380: Gml to TopoJson- Conversion succeeded, output in QGIS-...reproduced the GML → TopoJSON conversion with Aspose.GIS 26.5 and...