### Steps to reproduce

1. Login as a user with all meetings permissions

2. Go to an existing meeting occurrence

3. Add an agenda item and attach an image to it

4. Move Begin of the insertionor duplicateEnd of the insertion the agenda item to the next meeting Begin of the insertionoccurrence

5. Delete the initialEnd of the insertion occurrence


### What is the buggy behaviour?

* Image/attachment is not moved

* Broken image link is shown instead


### What is the expected behaviour?

1. Agenda item is moved with its attached image


###

### Screenshots and other files

<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/918250/content">

### Environment information

**OpenProject version**

Core build

[fb0eefb5287930732de1b4895f5b232222fe8ada](https://github.com/opf/openproject/commits/fb0eefb5287930732de1b4895f5b232222fe8ada)

Product version

[2f57a70dd455e8ac9de62708487287ff0e3e69a1](https://github.com/opf/saas-openproject/commits/2f57a70dd455e8ac9de62708487287ff0e3e69a1)

Core version

OpenProject 17.1.0

**Browser**

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

**Operating System**

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