\di+ cannot show the same name indexes

Hi,
After I create the same name index on the heap table and the temporary
table, I can only get the temporary table's index by \di+.

create table t1(c1 int);
create temp table t2(c1 int);

create index idx1 on t1(c1);
\di+
List of relations
Schema | Name | Type | Owner | Table | Size | Description
--------+------+-------+-------+-------+--------+-------------
public | idx1 | index | zhrt | t1 | 128 kB |
(1 row)

create index idx1 on t2(c1);
\di+
List of relations
Schema | Name | Type | Owner | Table | Size | Description
-------------+------+-------+-------+-------+--------+-------------
pg_temp_298 | idx1 | index | zhrt | t2 | 128 kB |
(1 row)

Is it the expected bavior?