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### Steps to reproduce

1. Login and create a doc of type Experimental on Edge or edit an existing one

2. With / find OpenProject work package option

3. When the search field appears, type a query that does not match any existing work package (e.g., a random string of letters)

4. Save the content


### What is the buggy behavior?

1. The placeholder text, "Search for work package ID or subject," is saved as a literal string in the editor.


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### What is the expected behavior?

1. Not entirely sure what the expected behavior is but maybe the editor should indicate that no results were found and it should prevent the user from saving a broken or non-functional Begin of the insertionlink? Mentioned at UX/UI daily and Parimal will take a look.End of the insertion Begin of the deletion link.End of the deletion


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### Environment information

**OpenProject version**

**Core build**

[14952c6f0e6935d904f5f224322859f5dcb0b8cb](https://github.com/opf/openproject/commits/14952c6f0e6935d904f5f224322859f5dcb0b8cb)

**Product version**

[a58c32168495791b5944adbc577c4f0db8b1af03](https://github.com/opf/saas-openproject/commits/a58c32168495791b5944adbc577c4f0db8b1af03)

**Core version**

OpenProject 16.5.0

**Browser**

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

**Operating System**

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