Can`t upgrade from 25.05 to 25.11

[N4gasak1]

Hello,
I've created a nixos configuration once with channel 25.05. Now I wanted to upgrade to 25.11 and encounter a... bug? Can someone please check it? I don't understand what I have to change for the 25.11 channel.
This is the error log:

warning: Git tree '/some/random/path/Test' is dirty
error: Cannot build '/nix/store/qrryds555khf97xq8fhi20pknymwd55d-kernel-modules-shrunk.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/sl1xf8h4cawvqvfbnqw55yvyl3gs9xl6-kernel-modules-shrunk
       Last 2 log lines:
       > Required modules: 9p 9pnet_virtio virtiofs virtio_pci virtio_blk virtio_balloon virtio_rng
       > Can not derive a closure of kernel modules because no modules were provided.
       For full logs, run:
         nix log /nix/store/qrryds555khf97xq8fhi20pknymwd55d-kernel-modules-shrunk.drv
error: Cannot build '/nix/store/apf81y167ia9fmzy4p68c0b6g395p6yg-vm-run-stage1.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/krdjwx1w5ykzna3frrjhqhd7w979hxsv-vm-run-stage1
error: Cannot build '/nix/store/ly9n4w1w4d6x2izj12lgna20wzpffl97-initrd.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/y7afziincgz2a9kmba3cl4n84va9f9p9-initrd
error: Cannot build '/nix/store/j1r3xyh45afk9z38r1arys5dr43as4jm-vm-run.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/jghmyzg9wf08m1mbkjcnraz4j2jsg7n9-vm-run
error: Cannot build '/nix/store/b6s1mjjrw69ck9lcw6lxrhx3i8hxqwy9-host-disko-images.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/zh8im56jxka8fg1mkw4abpcw5dzpp8lr-host-disko-images

The used building command:

nix build './#nixosConfigurations.host.config.system.build.diskoImages' && qemu-img convert -f raw -O qcow2 result/main.raw ./host.qcow2

When I build the following config with the 25.05 channel I am able to complete the building and can boot into my virtual maschine.

    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.05";
    system.stateVersion = "25.11";

{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.05";
    nixpkgs-unstable.url = "nixpkgs/nixos-unstable";
    disko.url = "github:nix-community/disko/latest";
    disko.inputs.nixpkgs.follows = "nixpkgs";
    
  };
  
  outputs = {
    self,
    nixpkgs,
    nixpkgs-unstable,
    disko,
    ...
  } @ inputs: let
    createSystemModule = configuration:
      nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          ./variables.nix
          ./host/default.nix
          disko.nixosModules.disko
        ];
      };
    
  in {
    nixosConfigurations = {
      host = createSystemModule "host";          
    };
  };
}

{ pkgs, modulesPath, lib, config, ... }:
{
  imports = [
    ./hardware-configuration.nix
  ];
  networking = {
    hostName = "host";
  };
  environment.systemPackages = with pkgs; [
    git
  ];
  services.openssh.enable = true;

  users = {
  };

  # Select internationalisation properties.
  i18n.defaultLocale = "${config.var.system_locale}";
  i18n.extraLocaleSettings = {
    LC_ADDRESS = "${config.var.system_locale}";
    LC_IDENTIFICATION = "${config.var.system_locale}";
    LC_MEASUREMENT = "${config.var.system_locale}";
    LC_MONETARY = "${config.var.system_locale}";
    LC_NAME = "${config.var.system_locale}";
    LC_NUMERIC = "${config.var.system_locale}";
    LC_PAPER = "${config.var.system_locale}";
    LC_TELEPHONE = "${config.var.system_locale}";
    LC_TIME = "${config.var.system_locale}";
  };
  # Configure console keymap
  console.keyMap = "de";

  hardware.enableRedistributableFirmware = true;
  time.timeZone = "${config.var.system_timezone}";
  system.stateVersion = "25.11";
}

{ config, lib, pkgs, modulesPath, ... }:

{
  imports =
    [ (modulesPath + "/profiles/qemu-guest.nix")
    ./disks.nix
    ];
  boot = {
    initrd.availableKernelModules = [ "ahci" "xhci_pci" "virtio_pci" "sr_mod" "virtio_blk" ];
    initrd.kernelModules = [ ];
    kernelModules = [ "kvm-intel" "iscsi_tcp" "dm_crypt" "rbd" ];
    kernelPackages = pkgs.linuxKernel.packages.linux_6_12;
    extraModulePackages = [ ];    
    loader.grub.efiSupport = lib.mkDefault true;
    loader.grub.efiInstallAsRemovable = lib.mkDefault true;    
    
  };
  swapDevices = [ ];
  networking.useDHCP = lib.mkDefault true;

  nix.settings.trusted-users = [ "admin"];
  nix.settings.experimental-features = [ "nix-command" "flakes" ];
  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
}

{config, ...}:
{
  disko.devices = {
    disk = {
      main = {
        # When using disko-install, we will overwrite this value from the commandline
        device = "/dev/vda";
        type = "disk";
        content = {
          type = "gpt";
          partitions = {
            MBR = {
              type = "EF02"; # for grub MBR
              size = "1M";
              priority = 1; # Needs to be first partition
            };
            ESP = {
              type = "EF00";
              size = "500M";
              content = {
                type = "filesystem";
                format = "vfat";
                mountpoint = "/boot";
                mountOptions = [ "umask=0077" ];
              };
            };
            root = {
              size = "100%";
              content = {
                type = "filesystem";
                format = "ext4";
                mountpoint = "/";
              };
            };
          };
        };
        imageSize = "${config.var.diskSize}G";
      };
    };
  };
}