Command not found ulimit

[Panadestein]

Hi, as the title describes, I cannot use ulimit if the grc fish plugin is active. I am on NixOS unstable and I installed the plugin with nixpkgs. The version available there is 61de7a8. This is what happens:

⌊φ ∈ nixos⌉ ulimit
grc: ulimit: No such file or directory
⌊φ ∈ nixos⌉ type ulimit
ulimit is a function with definition
# Defined in /nix/store/v648lfxchvm6hczyjzj2k84znxk85bdn-source/conf.d/grc.fish @ line 30
function ulimit
    set -l executable ulimit
        grc.wrap $executable $argv

end

System details:
Fish 3.7.0
NixOS unstable latest
Generic Colouriser 1.13