Can not build after flake update: justbuild v.1.6.3 fails

[Sveske-Juice]

After updating my flake inputs and trying to rebuild my NixOS config i get:

error: Cannot build '/nix/store/bf059gvwccms89ln17g1m6w8x71cqbwk-justbuild-1.6.3.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/7bn2dlnxg9qz17fby3jq91lbb1yh5dik-justbuild-1.6.3
       Last 25 log lines:
       >         ^^^^^^^^^^^^^^^^^
       >     ...<2 lines>...
       >     ],
       >     ^^
       >         cwd=src_wrkdir)
       >         ^^^^^^^^^^^^^^^
       >   File "/build/source/./bin/bootstrap.py", line 172, in run
       >     subprocess.run(cmd, cwd=cwd, check=True, **kwargs)
       >     ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
       >   File "/nix/store/62fdlzq1x1ak2lsxp4ij7ip5k9nia3hc-python3-3.13.7/lib/python3.13/subprocess.py", line 554, in run
       >     with Popen(*popenargs, **kwargs) as process:
       >          ~~~~~^^^^^^^^^^^^^^^^^^^^^^
       >   File "/nix/store/62fdlzq1x1ak2lsxp4ij7ip5k9nia3hc-python3-3.13.7/lib/python3.13/subprocess.py", line 1039, in __init__
       >     self._execute_child(args, executable, preexec_fn, close_fds,
       >     ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
       >                         pass_fds, cwd, env,
       >                         ^^^^^^^^^^^^^^^^^^^
       >     ...<5 lines>...
       >                         gid, gids, uid, umask,
       >                         ^^^^^^^^^^^^^^^^^^^^^^
       >                         start_new_session, process_group)
       >                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
       >   File "/nix/store/62fdlzq1x1ak2lsxp4ij7ip5k9nia3hc-python3-3.13.7/lib/python3.13/subprocess.py", line 1972, in _execute_child
       >     raise child_exception_type(errno_num, err_msg, err_filename)
       > FileNotFoundError: [Errno 2] No such file or directory: './out-boot/bin/just'
       For full logs, run:
         nix log /nix/store/bf059gvwccms89ln17g1m6w8x71cqbwk-justbuild-1.6.3.drv
error: Cannot build '/nix/store/0dfa5cmc1iq7bdmx2hd2x39b3427fgvd-init.lua.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/7ggm95dr1hqxc3nvdqyvmvxjicfxlbj9-init.lua
error: Cannot build '/nix/store/fhv0ajq7d5f02wqfhqbfqfw2nk0gw607-nvf-init.lua.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/j9i6pim4793qlns19prb7v7rxpmlv7ln-nvf-init.lua
error: Cannot build '/nix/store/m1w2sqfndhf03bn1zaliri901s76c9dy-init.lua.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/9pqdkh9jfh2wywrr6xb9w93fcmwadr3z-init.lua
error: Cannot build '/nix/store/d7a7pxglj9aj2pvf19mwcqw0l3vsjknv-nvf-print-config-path.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/in4npwvp9yxmh14yail4sv7da2qif4y4-nvf-print-config-path
error: Cannot build '/nix/store/49ibk692lpjbl5bmn6kxfl1r63q3ha46-nvf-with-helpers.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/kpk4xyx6l660hncwc7x20cfpyd4mfviw-nvf-with-helpers
error: Cannot build '/nix/store/rpi1hkgk0wsjr9w22cldbwfys3mq5vhf-nvf-with-helpers_fish-completions.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/any3lnyys4qm781idr8ji6b8mgpvs6ir-nvf-with-helpers_fish-completions
error: Cannot build '/nix/store/xd3s8zra4lcxmxmmxi8kjsi2xjkqi740-system-path.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/hhvalayh3y28bh6gmbzdyif6m92nlxm7-system-path
error: Cannot build '/nix/store/ljax86310d55dlg988ybflnsd0mf41lg-nixos-system-solituboks-25.11.20251009.0b4defa.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/973wza6w81ia3ix1kd8hvfgmcmc2alch-nixos-system-solituboks-25.11.20251009.0b4defa
Command 'nix --extra-experimental-features 'nix-command flakes' build --print-out-paths '.#nixosConfigurations."solituboks".config.system.build.toplevel' --show-trace --no-link' returned non-zero exit status 1.

It seems to be an issue with nvf-with-helpers_fish-completions.drv? but i'm not entirely sure

[NotAShelf]

We don't actually vendor fish completions (at least not deliberately) so I'm inclined to think that this is a problem with a dependency of a dependency. Likely a part of Nixpkgs' ongoing breakage trend in current unstable.