Remove order argument from group by, this result in as many groups as there are rows

osm2vectortiles.tm2source/data.yml

@@ -267,8 +267,7 @@ Layer:
             WHERE z(!scale_denominator!) = 14
           ) AS building
           WHERE geometry && !bbox!
-          GROUP BY underground, ST_YMin(ST_Envelope(geometry))
-          ORDER BY ST_YMin(ST_Envelope(geometry)) DESC
+          GROUP BY underground
         ) AS data
       type: postgis
       user: osm