[BUG] config.item master returns a changed value in a multi-master setup

Description
Api call config.item returns the given config value from a minion.
In a multi-master setup, variable master contains a list of addresses.
However, config.item master returns only one value, instead of the whole list.

Setup
Use two salt-masters. Use one salt-minion that is configured to use both salt-masters.

• on-prem machine
• VM (Virtualbox)
• VM running on a cloud service, please be explicit and add details
• container (Kubernetes, Docker, containerd, etc. please specify)
• or a combination, please be explicit
• jails if it is FreeBSD
• classic packaging
• onedir packaging
• used bootstrap to install

Steps to Reproduce the behavior
issue command config.item master to retrieve the value for variable master from the minion.

Expected behavior
The expected return value is the configured value (not an updated value).

Versions Report

Salt Version:
          Salt: 3005
 
Dependency Versions:
          cffi: Not Installed
      cherrypy: unknown
      dateutil: 2.8.1
     docker-py: Not Installed
         gitdb: 4.0.5
     gitpython: 3.1.14
        Jinja2: 2.11.3
       libgit2: Not Installed
      M2Crypto: Not Installed
          Mako: Not Installed
       msgpack: 1.0.0
  msgpack-pure: Not Installed
  mysql-python: Not Installed
     pycparser: Not Installed
      pycrypto: Not Installed
  pycryptodome: 3.9.7
        pygit2: Not Installed
        Python: 3.9.2 (default, Feb 28 2021, 17:03:44)
  python-gnupg: Not Installed
        PyYAML: 5.3.1
         PyZMQ: 20.0.0
         smmap: 4.0.0
       timelib: Not Installed
       Tornado: 4.5.3
           ZMQ: 4.3.4
 
System Versions:
          dist: debian 11 bullseye
        locale: utf-8
       machine: x86_64
       release: 5.10.0-18-amd64
        system: Linux
       version: Debian GNU/Linux 11 bullseye

Start by reproducing config.item master with one minion configured for two salt-masters, then trace the config.item entry point that reads the minion's configuration. Done means the command returns the complete configured list of master addresses rather than a changed or single value.