geohash_cover_geoms precisa revisão de condição

[ppKrauss]

Ver fonte da função aqui.
A função lixo() abaixo demonstra que há uma falha.

CREATE or replace FUNCTION lixo(
  input_geom geometry,
  input_prefix text     DEFAULT ''
) RETURNS TABLE(ghs text, is_contained boolean)  AS $f$
  WITH t0 AS ( SELECT ST_GeoHash(input_geom) AS ghs0 )
   SELECT ghs0, NULL
   FROM t0
   WHERE ghs0 LIKE input_prefix||'%'

  UNION ALL  -- theoretically never duplicates

   SELECT ghs, is_contained
   FROM (
     SELECT ghs, t1.geom,
            ST_Contains(input_geom,t1.geom) as is_contained
     FROM geohash_GeomsFromPrefix(input_prefix) t1, t0
     WHERE ST_Intersects(t1.geom,input_geom)
   ) t2
$f$ LANGUAGE SQL IMMUTABLE;

SELECT g.* FROM ec_azores_geom t, LATERAL lixo(t.geom,'6') g; -- teste1
   -- 6pr | f
   -- 6px | f
SELECT g.* FROM ec_azores_geom t, LATERAL lixo(t.geom,'6p') g; -- teste2
 -- 6   | 
 -- 6p  | f
 -- 6r  | f

SELECT ghs FROM ec_azores_geom t, LATERAL geohash_cover_geoms(t.geom,'6',NULL) g;
  --  6p,  6r

---- BUG:
SELECT ghs FROM ec_azores_geom t, LATERAL geohash_cover_geoms(t.geom,'6p',NULL,false) g; -- vazio!