FEW + MERGE on TABLE producing incorrect results

DataRec := RECORD
    UNSIGNED2   f1;
END;

dsTemp := DATASET
    (
        [1, 2, 3, 4, 5],
        DataRec
    );

ds := DISTRIBUTE(dsTemp);

TableRec := RECORD
    REAL8       average := AVE(GROUP, ds.f1);
END;

r1 := TABLE(ds, TableRec, FEW);
OUTPUT(r1, NAMED('WithoutMerge'));

r2 := TABLE(ds, TableRec, FEW, MERGE);
OUTPUT(r2, NAMED('WithMerge'));