Return nothing when SELECT NEXTVAL('seq') FROM tbl_local JOIN tbl_ref using(some)

[kissnono]

In citus12.0.0/12.1.1/12.1.3, the following SQL script returns nothing.

SELECT NEXTVAL('test_seq')
FROM tbl_local l
LEFT JOIN tbl_ref r
USING (c2);

But in citus11.3.0, it will execute normally.

It feels strange.
Thank you for reading and discussion.

SQL script for this scenario:
create table tbl_local(c1 varchar(5) not null,c2 varchar not null);
create table tbl_ref(c1 varchar(5) not null,c2 varchar not null);

select create_reference_table('tbl_ref');

insert into tbl_local values('A', 'A1'),('B', 'B1'),('C', 'C1'),('D', 'D1');
insert into tbl_ref values('A', 'A1'),('B', 'B1'),('C', 'C1'),('D', 'D1');

create sequence test_seq;