Hi Alexander,
I moved to new version 26.5 and here my results:
Please see:
Test data(input/output/QGIS)
5306 GeoJson GeoPackage.zip (48.3 KB)
Thanks,...to have a defined spatial reference. If the CRS is missing, Aspose...GeoPackage with explicit spatial reference var saveOptions = new GeoPackageSaveOption()...