Hi Alexander,
Please see conversion with QGIS , look on the star of the output, does output full overlay input?
Please see in mygeodata website:
Test data(input/output/QGIS)
5044 EsriJson -MafInfoTab.zip (14.0 KB)
…... Attribute mapping – field names that...CRS and preserves geometry/attributes when converting from EsriJSON...