Fill in from other locale creates empty entries that weren't there in the origin locale
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## Bug report

### Required System information

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- Node.js version: 18.20.3
- NPM version: 10.7.0
- Strapi version: 4.25.16
- Database: postgres
- Operating system: darwin-arm64
- Is your project Javascript or Typescript: Javascript

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### Describe the bug

A clear and concise description of what the bug is.

### Steps to reproduce the behavior

1. Go to Content Manager -> Pages -> Any page
2. Click on Fill in from another locale
3. Scroll down to a attribute that was not created in the locale we copied from
4. See error, the attribute got an empty entry in the newly created locale

### Expected behavior

I Expect that I get an exact copy paste of my copied locale, but instead I get a lot of empty created entries on my page.
This causes a lot of validation errors, the user needs to delete all these empty entries manually.

### Screenshots

If applicable, add screenshots to help explain your problem.

The locale (nl) I want to copy from the subTitle has no entry on this page. 
![image](https://github.com/user-attachments/assets/da5b61e2-9b3a-42b6-9247-fa7f4d7eb348)

The locale I filled in based on the nl locale, suddenly there is an empty entry for subTitle, because text is required the user will get errors.
![image](https://github.com/user-attachments/assets/adea750a-154b-476e-8bc1-b722e2fb2cc7)
