Hi,

I've finally could resolve it after fixing the system config where I had
to specify `dependencies` parameter and add additional Linux Kernel
modules.

`config.scm`
--8<---------------cut here---------------start------------->8---
...

  (initrd-modules (append (list "raid456"
                                "xfs")
                          %base-initrd-modules))
...
  (mapped-devices (list (mapped-device
                         (source (list "/dev/sda1" "/dev/sdb1"))
                         (targets (list "/dev/md0"))
                         (type raid-device-mapping))))
...
                       (file-system
                         (mount-point "/mnt/library")
                         (device "/dev/md0")
                         (type "xfs")
                         (dependencies mapped-devices))
...
--8<---------------cut here---------------end--------------->8---

After reconfiguration the the latests commit everything started to work!

--8<---------------cut here---------------start------------->8---
guix system describe
Generation 8    Jun 10 2025 09:05:59    (current)
  file name: /var/guix/profiles/system-8-link
  canonical file name: /gnu/store/jxl8s9zv961nfy92qv0v7d37gnxklcpi-system
  label: GNU with Linux 6.14.9
  bootloader: grub
  root device: UUID: defa5f0b-5d2f-4095-b299-39e5819cc54e
  kernel: /gnu/store/2ql958778ll2hm477jpf3hdxbkvr3l80-linux-6.14.9/bzImage
  channels:
    nonguix:
      repository URL: https://gitlab.com/nonguix/nonguix
      branch: master
      commit: fb6696c598f630ff46fe542a0523d47a788abaa0
    guix:
      repository URL: https://git.guix.gnu.org/guix.git
      branch: master
      commit: 2b8101b9edfebd763f5375cb25f9cf50b982b67a
  configuration file: /gnu/store/j1njzwkksrdq5wwcbmvfqy2545xh6d8n-configuration.scm
--8<---------------cut here---------------end--------------->8---

Closing this issue as no longer affecting.

--
Thanks,
Oleg