BUG #15716: pgadmin 4.3: row_to_json error

The following bug has been logged on the website:

Bug reference: 15716
Logged by: Jan Magnusson
Email address: jan(dot)magnusson0(at)gmail(dot)com
PostgreSQL version: 11.2
Operating system: windows 10 pro
Description:

The row_to_json() function does not produce any output data, only message.

b.r. Jan
------------------------------------------------------------------------------------
CREATE SCHEMA testing AUTHORIZATION postgres;

CREATE TABLE testing.batch
(
batch_id integer NOT NULL,
max_record integer,
record_count integer,
creation_ts timestamp without time zone DEFAULT now(),
CONSTRAINT batch_id_pkey PRIMARY KEY (batch_id)
)
WITH (
OIDS = FALSE
)
TABLESPACE pg_default;

insert into testing.batch values(1, now(), 0, 0);
insert into testing.batch values(2, now(), 1, 1);

select row_to_json(row(batch_id)) from testing.batch;

or

select row_to_json(b)
from (select * from testing.batch) b;

They only produce the following message, but no output:

Successfully run. Total query runtime: 70 msec.
2 rows affected.

Other client output of the latter:

{"batch_id":1,"max_record":0,"record_count":0,"creation_ts":"2019-03-26T16:44:34.338218"}
{"batch_id":2,"max_record":1,"record_count":1,"creation_ts":"2019-03-26T16:51:33.196218"}