JS-UDF N1QL query iterator closes with another DML is submitted

The query iterator (q1) closes when another DML  (select or insert) is submitted

var edge=[];

var q1 = N1QL("select * from routes"); // expected 67K
    for (const doc of q1)

{             edge.push(doc);           var x = N1QL("select count(*) from "+debug_ks);            x.close();     }

    q1.close();