Hi Alexander,
I moved to new version 26.5 and here my results:
Please see:
Comparison (left -csv, right -Gdb) through GeoJson.
image.png (206.5 KB)
Test data(input/output/QGIS)
5335-Csv-Gdb.zip (53.5 KB)
Thanks, …...GIS can parse (WKT, WKB, or separate X/Y columns)...