[BUG] jobs.list_jobs shows "Target": unknown-target when using pgjsonb returner

Description
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Hello Colleagues, I get an issue related to pgjsonb returner. The problem is: when I try to list jobs with the following command:

salt-run jobs.list_jobs search_function='pkg.update'

I get "Target": unknown-target

I suppose the issue in jsonb database load column.

CREATE TABLE jids (
jid varchar(255) NOT NULL primary key,
load jsonb NOT NULL
);

Filename: "/usr/local/lib/python3.6/site-packages/salt/returners/pgjsonb.py"

If you check jsonb schema, it has load column, which has an id property in json, as a name of target.
But other returners have tgt property instead of id, like postgres_local_cache.

if you pass a list of minions to salt -L 'minion1, minion2' the database load column has an id property with one minion and not a list, but it should be a list (array).

Also I checked jid utils file
Filename: /usr/local/lib/python3.6/site-packages/salt/utils/jid.py

it has the format_job_instance method, which also includes tgt, and if it is empty it shows unknown-target, and it shows unknown-target in pgjsonb returner, because it doesn't have tgt property, it uses id.

def format_job_instance(job):
'''
Format the job instance correctly
'''
ret = {'Function': job.get('fun', 'unknown-function'),
'Arguments': list(job.get('arg', [])),
# unlikely but safeguard from invalid returns
'Target': job.get('tgt', 'unknown-target'),
'Target-type': job.get('tgt_type', 'list'),
'User': job.get('user', 'root')}

Setup
(Please provide relevant configs and/or SLS files (be sure to remove sensitive info).
Filename: "/usr/local/lib/python3.6/site-packages/salt/returners/pgjsonb.py"

Steps to Reproduce the behavior
(Include debug logs if possible and relevant)

Expected behavior
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jobs.list_jobs and jobs.print_job should return Target: [minion1, minion2]. and not unknown-target.

jobs.print_job is also affected and should be changed to something similar

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Versions Report

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Additional context
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As a workaround I changed get_jids method in file /usr/local/lib/python3.6/site-packages/salt/returners/pgjsonb.py to below and it seems it is working, but I suppose it should be tgt as a target and not id.

def get_jids():
'''
Return a list of all job ids
'''
with _get_serv(ret=None, commit=True) as cur:

    #sql = '''SELECT jid, load
    #        FROM jids'''
    **sql = '''SELECT j.jid as jid, j.load as load, jsonb_agg(sr.id) as tgt FROM jids j
            join salt_returns sr
            using(jid)
            group by j.jid, j.load'''**

    cur.execute(sql)
    data = cur.fetchall()
    ret = {}
    **for** jid, load, tgt in data:
        **load["tgt"] = tgt**
        ret[jid] = salt.utils.jid.format_jid_instance(jid, load)
    return ret

Start with salt/returners/pgjsonb.py, especially get_jids, and compare its load data with salt/utils/jid.py's format_job_instance. Reproduce with jobs.list_jobs search_function='pkg.update' and check jobs.print_job as well. Done means both commands report the target, including a list such as [minion1, minion2], instead of unknown-target.