Postgres 13

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Help with an interesting Postgres question: Why isn't an Index Only Scan used on a partition accessed via the parent table?.

create table bla
( 
  id integer primary key, 
  some_number integer,
  some_value text,
  active boolean not null default true
);
create view active_blas
as
select id, some_number, some_value
from bla
where active
with check option
insert into active_blas (id, some_number, some_value)
values (1, 42, 'one');
1 rows affected

select *
from bla


id
some_number
some_value
active


1
42
one
t


select *
from active_blas


id
some_number
some_value


1
42
one