Bug: git gutter status not update after git add, nested workdir's .git is soft link

[can2049]

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Describe the bug / provide steps to reproduce it

Hi, I just commited a code patch, to fix that zed cannot recognize a git repo when workdir's .git is a soft link. This is the Pull Request #21153

Then I found a new bug.
When i tried to open from a google repo managed mono-repo. Git gutter status works not well.

how to produce?

mkdir monorepo_demo
cd monorepo_demo
mkdir .repo

mkdir good_repo
cd good_repo
echo "hello" > good.txt
git init
git add .
git commit -m "init"

# goto monorepo root
cd ..
mkdir bad_repo
echo "hello" > bad.txt
git init
git add .
git commit -m "init"
mv .git ../.repo/bag_repo.git
ln -sf  ../.repo/bag_repo.git .git

cd ..
# open Zed from monorepo root dir now
zed .

Then I got a monorepo with this file structure:

.
├── bad_repo
│   ├── bad.txt
│   └── .git -> ../.repo/bad_repo.git
├── good_repo
│   ├── .git
│   └── good.txt
└── .repo
    └── bad_repo.git

This is the screen record.
You can see the screen record, when I run git add . in the bad_repo, the git gutter status bar should disappear, but actually not.

Environment

Zed: v0.167.0 (Zed Dev 5318f52)
OS: Linux X11 ubuntu 20.04
Memory: 62.7 GiB
Architecture: x86_64
GPU: NVIDIA GeForce RTX 3060 || NVIDIA || 550.127.05

If applicable, add screenshots or screencasts of the incorrect state / behavior

If applicable, attach your Zed.log file to this issue.

Zed.log