[Bug report] git log shows a wrong history

[Adam Lee <adam8157@gmail.com>]

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

```
git clone https://github.com/greenplum-db/gpdb-postgres-merge.git
git_log_reproducer

cd git_log_reproducer/

git co -b iteration_REL_12_12 origin/iteration_REL_12_12

git log
```

What did you expect to happen? (Expected behavior)

A part of the history is:
```
...
commit 9ac9a7fd4138988d744e0b5767883c06c20ffa6f
commit fe0a9ddbdd7eee572f7321f9680280044fd5f258
...
```

What happened instead? (Actual behavior)

That part of the history is:
```
...
commit 9ac9a7fd4138988d744e0b5767883c06c20ffa6f
commit f9c655d647427b45ae0d7bd9baf3551a013b8ea1
commit fe0a9ddbdd7eee572f7321f9680280044fd5f258
...
```

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

commit f9c655d647427b45ae0d7bd9baf3551a013b8ea1 is at the wrong place.

`git log --graph` is fine.

Anything else you want to add:

[System Info]
git version:
git version 2.34.1
cpu: x86_64
no commit associated with this build
sizeof-long: 8
sizeof-size_t: 8
shell-path: /bin/sh
uname: Linux 5.15.0-52-generic #58-Ubuntu SMP Thu Oct 13 08:03:55 UTC
2022 x86_64
compiler info: gnuc: 11.2
libc info: glibc: 2.35
$SHELL (typically, interactive shell): /bin/bash

[Enabled Hooks]

-- 
Adam