"Export all data as csv" not exporting all data

The "Export all data as csv" menu item (top right of grid UI) appears to export the same number of records as the "Export visible data as csv".

When tested using z.show(...) to display a dataframe containing more than zeppelin.spark.maxResult records, the output exported by both these commands was limited by zeppelin.spark.maxResult, and contained exactly the same number of records.