42.2.3 regression in fn timestampadd(SQL_TSI_MINUTE)

Simple Java 8 test case below outputs different results when run against 
the 42.2.2 driver vs. the just released 42.2.3 driver:

PostgreSQL JDBC Driver 42.2.2
PostgreSQL 10.4 database "labkey2"
SQL_TSI_SECOND: 2003-01-01 00:00:03.0
SQL_TSI_MINUTE: 2003-01-01 00:03:00.0
SQL_TSI_HOUR: 2003-01-01 03:00:00.0

PostgreSQL JDBC Driver 42.2.3
PostgreSQL 10.4 database "labkey2"
SQL_TSI_SECOND: 2003-01-01 00:00:03.0
SQL_TSI_MINUTE: 2003-01-01 00:00:03.0
SQL_TSI_HOUR: 2003-01-01 03:00:00.0

SQL_TSI_MINUTE seems to be acting like SQL_TSI_SECOND in 42.2.3.

Thanks,
Adam

import java.sql.*;

public class PGTest
{
     public static void main(String[] args)throws SQLException
     {
         try (Connection conn = (3 == args.length ? DriverManager.getConnection(args[0], args[1], args[2]) : DriverManager.getConnection("jdbc:postgresql://" + args[0] +":" + args[1] +"/" + args[2], args[3], args[4])))
         {
             DatabaseMetaData dmd = conn.getMetaData();
             System.out.println(dmd.getDriverName() +" " + dmd.getDriverVersion());
             System.out.println(dmd.getDatabaseProductName() +" " + dmd.getDatabaseProductVersion() +" database \"" + conn.getCatalog() +"\"");

             testTimestampAdd("SQL_TSI_SECOND", conn);
             testTimestampAdd("SQL_TSI_MINUTE", conn);
             testTimestampAdd("SQL_TSI_HOUR", conn);

             System.out.flush();
             System.out.close();
         }
     }

     private static void testTimestampAdd(String interval, Connection conn)throws SQLException
     {
         String sql ="SELECT {fn timestampadd(" + interval +", 3, CAST('01 Jan 2003' AS TIMESTAMP))} AS ThreeMinutes";
         try (Statement st = conn.createStatement(); ResultSet rs = st.executeQuery(sql))
         {
             while (rs.next())
                 System.out.println(interval +": " + rs.getTimestamp(1));
         }
     }
}