fish_command_not_found override breaks default command-not-found implementation

[kevindetry]

Describe the bug
mise activate fish overrides the default fish_command_not_found implementation in a way that breaks the default command-not-found handling.

To Reproduce
Using Arch, add mise activate fish | source to ~/.config/fish/config.fish. Try to call a binary that isn't installed:

~> htop
fish: Unknown command: htop

Expected behavior
Using Arch with pkgfile installed, without mise activate fish | source in config:

~> htop
htop may be found in the following packages:
  extra/htop 3.3.0-1	/usr/bin/htop

mise doctor output

mise version:
  2024.2.4 linux-x64 (2024-02-05)

build:
  Target: x86_64-unknown-linux-gnu
  Features: DEFAULT, NATIVE_TLS
  Built: Mon, 5 Feb 2024 22:00:01 +0000
  Rust Version: rustc 1.75.0 (82e1608df 2023-12-21)
  Profile: release

shell:
  fish
  fish, version 3.7.0

mise data directory:
  /home/kevindetry/.local/share/mise

mise environment variables:
  MISE_SHELL=fish

settings:
  activate_aggressive = false
  all_compile = false
  always_keep_download = false
  always_keep_install = false
  asdf_compat = false
  cargo_binstall = true
  color = true
  disable_default_shorthands = false
  disable_tools = []
  experimental = false
  jobs = 4
  legacy_version_file = true
  legacy_version_file_disable_tools = []
  node_compile = false
  not_found_auto_install = true
  paranoid = false
  plugin_autoupdate_last_check_duration = "7d"
  python_compile = false
  python_default_packages_file = "/home/kevindetry/.default-python-packages"
  python_pyenv_repo = "https://github.com/pyenv/pyenv.git"
  python_venv_auto_create = false
  raw = false
  trusted_config_paths = []
  quiet = false
  verbose = false
  yes = false
  ci = false
  debug = false
  trace = false
  log_level = "info"

  [status]
  missing_tools = "if_other_versions_installed"
  show_env = false
  show_tools = false


config files:

plugins:
  bun      (core)
  deno     (core)
  go       (core)
  java     (core)
  node     (core)
  python   (core)
  ruby     (core)

toolset:


No problems found

[kevindetry]

Seems to be broken again with #1665

Without and not functions -q __mise_fish_command_not_found command-not-found handler works as expected.

[kevindetry]

@jdx, would it be possible to reopen this issue? :)