### Steps to reproduce

1. Login as user with permission to track time

2. Add a time entry without end and start time

3. Go to Profile  > My time tracking

4. Choose the calendar view

5. Hover over the time entry

6. Drag the lateral handles


### What is the buggy behaviour?

* Entry doesn't save the Begin of the insertionresizedEnd of the insertion Begin of the deletion draggedEnd of the deletion value


### What is the expected behaviour?

1. TBD Marc


### Screenshots and other files

<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/715257/content">

### Environment information

**OpenProject version**

Core build

[0d74791e13d657830efe701f78f96fc769dca7c8](https://github.com/opf/openproject/commits/0d74791e13d657830efe701f78f96fc769dca7c8)

Product version

[07b51a014e52eef39a20daf9fda7b8a43b210b53](https://github.com/opf/saas-openproject/commits/07b51a014e52eef39a20daf9fda7b8a43b210b53)

Core version

OpenProject 16.2.0

**Browser**

* [ ] Chrome
* [x] Firefox 139.4.0
* [ ] 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)