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, …...Bug 5335: Csv to Gdb- Conversion succeeded, are input and output...From what you describe, the conversion itself finishes without error...