Changelog only generates the title but did not generate content

**Describe the bug**

Changelog only generates the title but did not generate content when using Github PR Merge(Merge pull request button)

**To Reproduce**

1. next branch commit 'feat: feature 11'
2. create pull request on github
3. click **Merge pull request** button(Not Rebase merge or Squash merge)
4. git switch main && git pull
5. npx auto shipit

**Expected behavior**

Changelog should generates content

**Screenshots**



**Environment information:**

GitHub Codespace Environment

```txt
// package.json
"devDependencies": {
"@auto-it/conventional-commits": "10.37.4",
"@auto-it/omit-commits": "10.37.4",
"auto": "10.37.4"
}
```
```txt
// auto.config.js
plugins: [
// ['omit-commits', { labels: 'skip-release' }],
'conventional-commits',
'released',
'npm',
]
```

**Additional context**