strange update problem with 7.2.1

Hi,

we've got rather strange problem with updating and GiST indices.
Below is a test run:

drop table tst;
create table tst ( a int[], i int );
copy tst from stdin;
........
\.
create index tsti on tst using gist (a);
vacuum full analyze;


test=# update tst set i = i+10   where a && '{3,4}';
UPDATE 3267
test=# set enable_indexscan=off;
SET VARIABLE
test=# update tst set i = i+10   where a && '{3,4}';
UPDATE 4060
test=# select count(*) from tst   where a && '{3,4}';count
------- 4060
(1 row)

test=# select version();                           version
---------------------------------------------------------------PostgreSQL 7.2.1 on i686-pc-linux-gnu, compiled by GCC
2.95.3
(1 row)

enabling gist indices cause some rows doesn't updating !
Please find attached test sql script (need to install contrib/intarray module)
Regards,    Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83