Hi Alexander,
I moved to new version 26.5 and here my results:
Please see:
Comparison(left-Csv, right-Shapefile)
image.png (189.9 KB)
Test data(input/output/QGIS)
5323-Csv-Shapefile.zip (46.7 KB)
Thanks,...columns have different names, map them: // csv.FeatureTable.Columns["Longitude"]...