[BUG] kernelparams grain shows nonsense

Description
The kernelparams grain on my systems shows:

    kernelparams:
        |_
          - root
          - None
        |_
          - rootflags
          - None
        |_
          - ro
          - None
        |_
          - initrd
          - EFIdebianinitrd.img

where /proc/cmdline shows:

% cat /proc/cmdline 
root=UUID=1782601d-4dea-4310-a3fa-d64d03ee51fd rootflags=subvol=@root ro initrd=EFI\debian\initrd.img

Please fix.

Setup

• on-prem machine
• VM (Virtualbox, KVM, etc. please specify)
• 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

Steps to Reproduce the behavior

salt-call grains.items

Expected behavior
Should show something that reflects the current kernel params.

Screenshots
See output above.

Versions Report

# salt-call --versions-report                                                                                             :(
Salt Version:
          Salt: 3003.3
 
Dependency Versions:
          cffi: Not Installed
      cherrypy: Not Installed
      dateutil: 2.8.1
     docker-py: Not Installed
         gitdb: Not Installed
     gitpython: Not Installed
        Jinja2: 2.11.3
       libgit2: Not Installed
      M2Crypto: Not Installed
          Mako: Not Installed
       msgpack: 1.0.0
  msgpack-pure: Not Installed
  mysql-python: 1.4.4
     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: Not Installed
       timelib: Not Installed
       Tornado: 4.5.3
           ZMQ: 4.3.4
 
System Versions:
          dist: debian 11 bullseye
        locale: utf-8
       machine: x86_64
       release: 5.10.0-8-amd64
        system: Linux
       version: Debian GNU/Linux 11 bullseye

Reproduce with salt-call grains.items and compare the kernelparams grain with /proc/cmdline on the reported Debian 11 system. Trace the grain entry point and its parsing behavior, then verify that the reported parameters and values are represented correctly in the grain output.