BUG #14025: Unable to validate constraints

The following bug has been logged on the website:

Bug reference: 14025
Logged by: Jan
Email address: jan(dot)kort(at)genetics(dot)nl
PostgreSQL version: 9.4.1
Operating system: Windows 2012 Server
Description:

When I do:
- disable trigger all
- incorrect foreign key reference
- enable trigger all
- validate
Then I get no error, I was expecting an error.

For example:

-- This succeeds (expected)
drop table if exists test1;
drop table if exists test2;
create table test2 (id int primary key);
create table test1 (id int primary key, test2_id int references test2(id));
insert into test2 (id) values (1);
insert into test1 (id, test2_id) values (1, 1);

-- This fails (expected)
drop table if exists test1;
drop table if exists test2;
create table test2 (id int primary key);
create table test1 (id int primary key, test2_id int references test2(id));
alter table test1 disable trigger user;
insert into test1 (id, test2_id) values (1, 1);
alter table test1 enable trigger user;

-- This succeeds (unexpected)
drop table if exists test1;
drop table if exists test2;
create table test2 (id int primary key);
create table test1 (id int primary key, test2_id int references test2(id));
alter table test1 disable trigger all;
insert into test1 (id, test2_id) values (1, 1);
alter table test1 enable trigger all;
alter table test1 validate constraint test1_test2_id_fkey;

Regards,

Jan