Missing shell completions for fish

[MariaSolOs]

brew doctor output

Your system is ready to brew.

Verification

• My "brew doctor output" above says Your system is ready to brew. and am still able to reproduce my issue.
• I ran brew update twice and am still able to reproduce my issue.
• This issue's title and/or description do not reference a single formula e.g. brew install wget. If they do, open an issue at https://github.com/Homebrew/homebrew-core/issues/new/choose instead.

brew config output

HOMEBREW_VERSION: 4.1.17-37-g97eda64
ORIGIN: https://github.com/Homebrew/brew
HEAD: 97eda6479039d7f91e08da72135fbef28b65ef8d
Last commit: 5 hours ago
Core tap JSON: 28 Oct 21:27 UTC
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_EDITOR: /Users/majosolano/nvim/bin/nvim
HOMEBREW_MAKE_JOBS: 10
HOMEBREW_SORBET_RUNTIME: set
Homebrew Ruby: 2.6.10 => /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby
CPU: 10-core 64-bit arm_firestorm_icestorm
Clang: 15.0.0 build 1500
Git: 2.39.3 => /Library/Developer/CommandLineTools/usr/bin/git
Curl: 8.1.2 => /usr/bin/curl
macOS: 14.0-arm64
CLT: 15.0.0.0.1.1694021235
Xcode: N/A
Rosetta 2: false

What were you trying to do (and why)?

I wanted to use the brew CLI and expected fish shell completions.

What happened (include all command output)?

After typing brew ins<tab>, no completion for brew install appears. This happens with all brew commands.

What did you expect to happen?

For fish shell completion to run as advertised.

Step-by-step reproduction instructions (by running brew commands)

1. With brew and fish installed, set up shell completion as indicated in the docs (I had to do this because I installed fish using the installer instead of via brew).
2. In a fish shell, type brew ins<tab>.
3. Notice how there are no brew completions.