Bugreport - submodules are fetched twice in some cases

[Benedek Kozma <cyberbeni@gmail.com>]

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)
Run the following command with 1 remote:
`git fetch --all --prune --prune-tags`
I have the following in my config that could affect this:
```
[submodule]
recurse = true
[fetch]
parallel = 0
```

What did you expect to happen? (Expected behavior)
Submodules are only fetched once.

What happened instead? (Actual behavior)
Submodules are fetched twice.

What's different between what you expected and what actually happened?
The process takes longer

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 2.36.0
cpu: arm64
no commit associated with this build
sizeof-long: 8
sizeof-size_t: 8
shell-path: /bin/sh
feature: fsmonitor--daemon
uname: Darwin 21.4.0 Darwin Kernel Version 21.4.0: Fri Mar 18 00:46:32
PDT 2022; root:xnu-8020.101.4~15/RELEASE_ARM64_T6000 arm64
compiler info: clang: 13.1.6 (clang-1316.0.21.2)
libc info: no libc information available
$SHELL (typically, interactive shell): /bin/zsh


[Enabled Hooks]
pre-commit