bug: `git fetch origin main:main` fails when main is HEAD

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Thank you for filling out a Git bug report!
Please answer the following questions to help us understand your issue.

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

Clone a repository and run this command:

git fetch origin main:main

What did you expect to happen? (Expected behavior)

Nothing extraordinary happens. The branch is up to date.

What happened instead? (Actual behavior)

fatal: refusing to fetch into branch 'refs/heads/main' checked out at ''
fatal: the remote end hung up unexpectedly
remote: ========================================================================
remote: rpc error: code = Canceled desc = running upload-pack: user
canceled the request
remote: ========================================================================

Anything else you want to add:

If I checkout to another branch and run the same `git fetch` command on
this branch, the same error happens.

Further, if change HEAD but keep the same branch name, like this:

git checkout HEAD^
git checkout -B main

... then `git fetch origin main:main` fails as well.

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 2.45.0
cpu: x86_64
no commit associated with this build
sizeof-long: 8
sizeof-size_t: 8
shell-path: /bin/sh
uname: Linux 6.8.9-arch1-2 #1 SMP PREEMPT_DYNAMIC Tue, 07 May 2024
21:35:54 +0000 x86_64
compiler info: gnuc: 13.2
libc info: glibc: 2.39
$SHELL (typically, interactive shell): /bin/sh

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

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