[BUG] "master_job_cache" option failed in CentOS7

Description
"master_job_cache" option failed in CentOS7 with "postgres", "postgres_local_cache" and "pgjsonb" returners, when I execute any "salt-ssh" command.

Setup

master_job_cache: postgres
event_return: postgres
returner.postgres.host: '127.0.0.1'
returner.postgres.user: 'salt'
returner.postgres.pass: 'salt'
returner.postgres.db: 'salt'
returner.postgres.port: 5432
keep_jobs: 24
archive_jobs: True

Please be as specific as possible and give set-up details.

• VM Vagrant with CentOS7 box
• VM running on a cloud service with CentOS7 image

Steps to Reproduce the behavior

$ salt-ssh --user=vagrant --passwd=vagrant --sudo "192.168.10.2" -ir "echo hi"

[ERROR   ] An un-handled exception was caught by salt's global exception handler:
KeyError: 'postgres.prep_jid'
Traceback (most recent call last):
  File "/bin/salt-ssh", line 11, in <module>
    load_entry_point('salt==3004.2', 'console_scripts', 'salt-ssh')()
  File "/usr/lib/python3.6/site-packages/salt/scripts.py", line 459, in salt_ssh
    client.run()
  File "/usr/lib/python3.6/site-packages/salt/cli/ssh.py", line 22, in run
    ssh.run()
  File "/usr/lib/python3.6/site-packages/salt/client/ssh/__init__.py", line 738, in run
    jid = self.returners[fstr](passed_jid=jid or self.opts.get("jid", None))
  File "/usr/lib/python3.6/site-packages/salt/loader/lazy.py", line 334, in __getitem__
    super().__getitem__(item)  # try to get the item from the dictionary
  File "/usr/lib/python3.6/site-packages/salt/utils/lazy.py", line 105, in __getitem__
    raise KeyError(key)
KeyError: 'postgres.prep_jid'
Traceback (most recent call last):
  File "/bin/salt-ssh", line 11, in <module>
    load_entry_point('salt==3004.2', 'console_scripts', 'salt-ssh')()
  File "/usr/lib/python3.6/site-packages/salt/scripts.py", line 459, in salt_ssh
    client.run()
  File "/usr/lib/python3.6/site-packages/salt/cli/ssh.py", line 22, in run
    ssh.run()
  File "/usr/lib/python3.6/site-packages/salt/client/ssh/__init__.py", line 738, in run
    jid = self.returners[fstr](passed_jid=jid or self.opts.get("jid", None))
  File "/usr/lib/python3.6/site-packages/salt/loader/lazy.py", line 334, in __getitem__
    super().__getitem__(item)  # try to get the item from the dictionary
  File "/usr/lib/python3.6/site-packages/salt/utils/lazy.py", line 105, in __getitem__
    raise KeyError(key)
KeyError: 'postgres.prep_jid'

Expected behavior
Execute correctly the "salt-ssh" command and returns "hi".

Versions Report

Salt Version:
          Salt: 3004.2
 
Dependency Versions:
          cffi: Not Installed
      cherrypy: unknown
      dateutil: Not Installed
     docker-py: Not Installed
         gitdb: Not Installed
     gitpython: Not Installed
        Jinja2: 2.11.1
       libgit2: Not Installed
      M2Crypto: 0.35.2
          Mako: Not Installed
       msgpack: 0.6.2
  msgpack-pure: Not Installed
  mysql-python: Not Installed
     pycparser: Not Installed
      pycrypto: Not Installed
  pycryptodome: Not Installed
        pygit2: Not Installed
        Python: 3.6.8 (default, Nov 16 2020, 16:55:22)
  python-gnupg: Not Installed
        PyYAML: 3.13
         PyZMQ: 17.0.0
         smmap: Not Installed
       timelib: Not Installed
       Tornado: 4.5.3
           ZMQ: 4.1.4
 
System Versions:
          dist: centos 7 Core
        locale: ANSI_X3.4-1968
       machine: x86_64
       release: 3.10.0-1127.el7.x86_64
        system: Linux
       version: CentOS Linux 7 Core

Additional context
I've tested this config on RockyLinux8 and runs perfectly.

Start with salt/client/ssh/init.py at the call reported near line 738, following the salt-ssh entry point through salt/cli/ssh.py. Reproduce the CentOS 7 configuration with the postgres, postgres_local_cache, and pgjsonb returners, then compare the behavior with Rocky Linux 8. Done means the command completes and returns "hi" without the KeyError for postgres.prep_jid.