### Steps to reproduce

1. Login with an admin user, both for the instance and the project you will copy

2. Go to any project (i will call it project A)

3. Go to Project A's Project Settings > Information

4. Click on the upper right 3 dots menu

5. Click on Copy

6. In the form add any name (i will call it Project B)

7. In the \`Subproject of\` drop-down, search for Project A


### What is the buggy behavior?

* Project A doesn't show up in the search results Begin of the insertion

* Projects that are subprojects of Project A don't show up as well.


End of the insertion Begin of the deletion


End of the deletion ### What is the expected behavior?

1. Project A is part of the search results


### Note

after project B is copied as a main project, it's possible to make it a subproject of project A from the Project information page

### Screenshots and other files

<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/309345/content">

### Environment information

**OpenProject version**

Core build

[dba0f05bd906760fd0e2532111f004373c4c2fcd](https://github.com/opf/openproject/commits/dba0f05bd906760fd0e2532111f004373c4c2fcd)

Product version

[0dafec4059b6ee48bf7fe187bbb7b895e1171db3](https://github.com/opf/saas-openproject/commits/0dafec4059b6ee48bf7fe187bbb7b895e1171db3)

Core version

OpenProject 15.2.1

**Browser**

* [ ] Chrome
* [x] Firefox
* [ ] Safari
* [ ] Mobile Safari
* [ ] Other (please specify)

**Operating System**

* [x] Windows 11Pro
* [ ] Mac OS X
* [ ] Mobile iOS
* [ ] Mobile Android
* [ ] Linux (please specify distro)
* [ ] Chrome OS
* [ ] Other (please specify)