Unexpected output of PgRules

Hi Team,
I'm writing to clarify one of the expected output in rules.out file.

Why does value at this line
https://github.com/postgres/postgres/blob/913c60b067aa1a618420fd0372c4df3cf5501863/src/test/regress/expected/rules.out#L594
for rtest_t6 is zeros. When we have defined the rule for rtest_t6 as:
create rule rtest_t4_ins2 as on insert to rtest_t4
where new.a >= 20 and new.a < 30 do
insert into rtest_t6 values (new.a, new.b);

Therefore:
At
https://github.com/postgres/postgres/blob/913c60b067aa1a618420fd0372c4df3cf5501863/src/test/regress/expected/rules.out#L576
/ insert into rtest_t4 select * from rtest_t9 where b ~ 'and t8';
Shouldn't insert the rows with value as  26 and 28 as well. Isn't it ? as
rules says to insert the rows in rtest_t6 tables if value is from
20(inclusive) to 30 (exclusive).

Please help me with the clarification.

Thanks
Manav