[BUG] Not working grains lead to crashed salt-minon

Description
Hello,

I deployed a weird and not working custom grains.

but when i do this, saltstack runs "well" but cannot be restarted else, it will not start at all.

Steps to Reproduce the behavior

Jun 13 15:30:52 server systemd[1]: Started The Salt Minion.
Jun 13 15:30:53 server salt-minion[1064472]: [CRITICAL] Failed to load grains defined in grain file installed_packages.installed_packages in function <LoadedFunc name='installed_packages.installed_packages'>, error:
Jun 13 15:30:53 server salt-minion[1064472]: Traceback (most recent call last):
Jun 13 15:30:53 server salt-minion[1064472]:   File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/loader/__init__.py", line 1188, in grains
Jun 13 15:30:53 server salt-minion[1064472]:     ret = funcs[key](**kwargs)
Jun 13 15:30:53 server salt-minion[1064472]:   File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/loader/lazy.py", line 160, in __call__
Jun 13 15:30:53 server salt-minion[1064472]:     ret = self.loader.run(run_func, *args, **kwargs)
Jun 13 15:30:53 server salt-minion[1064472]:   File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/loader/lazy.py", line 1269, in run
Jun 13 15:30:53 server salt-minion[1064472]:     return self._last_context.run(self._run_as, _func_or_method, *args, **kwargs)
Jun 13 15:30:53 server salt-minion[1064472]:   File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/loader/lazy.py", line 1284, in _run_as
Jun 13 15:30:53 server salt-minion[1064472]:     ret = _func_or_method(*args, **kwargs)
Jun 13 15:30:53 server salt-minion[1064472]:   File "/var/cache/salt/minion/extmods/grains/installed_packages.py", line 5, in installed_packages
Jun 13 15:30:53 server salt-minion[1064472]:   File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/modules/pkgutil.py", line 157, in list_pkgs
Jun 13 15:30:53 server salt-minion[1064472]:     if "pkg.list_pkgs" in __context__ and kwargs.get("use_context", True):
Jun 13 15:30:53 server salt-minion[1064472]: NameError: name '__context__' is not defined
Jun 13 15:30:53 server salt-minion[1064472]: [CRITICAL] Failed to load grains defined in grain file installed_packages.installed_packages in function <LoadedFunc name='installed_packages.installed_packages'>, error:
Jun 13 15:30:53 server salt-minion[1064472]: Traceback (most recent call last):
Jun 13 15:30:53 server salt-minion[1064472]:   File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/loader/__init__.py", line 1188, in grains
Jun 13 15:30:53 server salt-minion[1064472]:     ret = funcs[key](**kwargs)
Jun 13 15:30:53 server salt-minion[1064472]:   File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/loader/lazy.py", line 160, in __call__
Jun 13 15:30:53 server salt-minion[1064472]:     ret = self.loader.run(run_func, *args, **kwargs)
Jun 13 15:30:53 server salt-minion[1064472]:   File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/loader/lazy.py", line 1269, in run
Jun 13 15:30:53 server salt-minion[1064472]:     return self._last_context.run(self._run_as, _func_or_method, *args, **kwargs)
Jun 13 15:30:53 server salt-minion[1064472]:   File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/loader/lazy.py", line 1284, in _run_as
Jun 13 15:30:53 server salt-minion[1064472]:     ret = _func_or_method(*args, **kwargs)
Jun 13 15:30:53 server salt-minion[1064472]:   File "/var/cache/salt/minion/extmods/grains/installed_packages.py", line 5, in installed_packages
Jun 13 15:30:53 server salt-minion[1064472]:   File "/opt/saltstack/salt/lib/python3.10/site-packages/salt/modules/pkgutil.py", line 157, in list_pkgs
Jun 13 15:30:53 server salt-minion[1064472]:     if "pkg.list_pkgs" in __context__ and kwargs.get("use_context", True):
Jun 13 15:30:53 server salt-minion[1064472]: NameError: name '__context__' is not defined

Expected behavior
The customs grains cannot load, ok, but i need at least to have a minion which starts to permit redeployment of a fix.

Versions Report

[root@server ~]# salt-minion --versions-report
Salt Version:
          Salt: 3007.4
 
Python Version:
        Python: 3.10.17 (main, Jun  9 2025, 20:41:48) [GCC 11.2.0]
 
Dependency Versions:
          cffi: 1.16.0
      cherrypy: 18.8.0
  cryptography: 42.0.5
      dateutil: 2.8.2
     docker-py: Not Installed
         gitdb: Not Installed
     gitpython: Not Installed
        Jinja2: 3.1.6
       libgit2: Not Installed
  looseversion: 1.3.0
      M2Crypto: Not Installed
          Mako: Not Installed
       msgpack: 1.0.7
  msgpack-pure: Not Installed
  mysql-python: Not Installed
     packaging: 24.0
     pycparser: 2.21
      pycrypto: Not Installed
  pycryptodome: 3.19.1
        pygit2: Not Installed
  python-gnupg: 0.5.2
        PyYAML: 6.0.1
         PyZMQ: 25.1.2
        relenv: 0.19.3
         smmap: Not Installed
       timelib: 0.3.0
       Tornado: 6.4.2
           ZMQ: 4.3.4
 
Salt Package Information:
  Package Type: onedir
 
System Versions:
          dist: rocky 9.5 Blue Onyx
        locale: utf-8
       machine: x86_64
       release: 5.14.0-503.23.2.el9_5.x86_64
        system: Linux
       version: Rocky Linux 9.5 Blue Onyx

Additional context
Add any other context about the problem here.

Start with salt/loader/init.py and salt/modules/pkgutil.py, which appear in the traceback, and trace how exceptions from custom grains are handled during minion startup. Reproduce the failure with a grain that raises NameError; done means the minion starts despite the grain failing so the grain can be fixed or removed.