`git log FETCH_HEAD` only logs whatever happens to be the first among the fetched refs (instead of all the fetched refs)

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What did you do before the bug happened? (Steps to reproduce your issue)

cd '/'; cd '/'; rm --force --recursive -- './test_git2'; mkdir "$_"; cd "$_"; mkdir --parents -- './server' './client';

git -C './server' init --bare './repo.git' branch_default_path="$(git -C './server/repo.git' symbolic-ref HEAD)" branch_default_name="${branch_default_path#'refs/heads/'}" git --git-dir='./server/repo.git' --work-tree='.' commit --allow-empty -m "$((++number))" git --git-dir='./server/repo.git' --work-tree='.' checkout -b branch1

git -C './client' init './repo'

git --git-dir='./server/repo.git' --work-tree='.' commit --allow-empty -m "$((++number))" git -C './client/repo' fetch 'file://'"$(realpath './server/repo.git')" "$branch_default_name" 'branch1' cat './client/repo/.git/FETCH_HEAD' git -C './client/repo' log --all git -C './client/repo' log --all FETCH_HEAD awk 'BEGIN { ORS = "\0"; } { print $1; }' <'./client/repo/.git/FETCH_HEAD' | xargs --null git -C './client/repo' log --all

git --git-dir='./server/repo.git' --work-tree='.' commit --allow-empty -m "$((++number))" git -C './client/repo' fetch 'file://'"$(realpath './server/repo.git')" 'branch1' "$branch_default_name" cat './client/repo/.git/FETCH_HEAD' git -C './client/repo' log --all git -C './client/repo' log --all FETCH_HEAD awk 'BEGIN { ORS = "\0"; } { print $1; }' <'./client/repo/.git/FETCH_HEAD' | xargs --null git -C './client/repo' log --all

What did you expect to happen? (Expected behavior)

`git -C './client/repo' log --all FETCH_HEAD` logs all commits.

What happened instead? (Actual behavior)

`git -C './client/repo' log --all FETCH_HEAD` logs $GIT_DEFAULT_BRANCH when $GIT_DEFAULT_BRANCH is listed first in `git fetch`, logs branch1 when branch1 is listed first in `git fetch`.

What's different between what you expected and what actually happened?

Anything else you want to add:

Please review the rest of the bug report below. You can delete any lines you don't wish to share.

[System Info]
git version:
git version 2.46.0.windows.1
cpu: x86_64
built from commit: 2e6a859ffc0471f60f79c1256f766042b0d5d17d
sizeof-long: 4
sizeof-size_t: 8
shell-path: D:/git-sdk-64-build-installers/usr/bin/sh
feature: fsmonitor--daemon
libcurl: 8.9.0
OpenSSL: OpenSSL 3.2.2 4 Jun 2024
zlib: 1.3.1
uname: Windows 10.0 22631
compiler info: gnuc: 14.1
libc info: no libc information available
$SHELL (typically, interactive shell): C:\Program Files\Git\usr\bin\bash.exe

[Enabled Hooks] not run from a git repository - no hooks to show