Hi Alexander,
I moved to new version 26.5 and here my results:
Please see:
Test data(input/output/QGIS)
5399 Gml GeoJsonSeq.zip (90.5 KB)
Thanks,...features when inspected as plain text, but QGIS shows an empty layer...GeoJsonWriterSetting { Encoding = System.Text.Encoding.UTF8 })) { // Write...