### Steps to reproduce

1. Go to Team planner's module and select an existing Team planner.

2. Click on a date to create a new work package in the Team planner as a task, _do not drag multiple days_

3. Select the task, go to relations and create a new child.


### What is the buggy behavior?

* After creating the child work package, both work packages disappear in the Team planner's view.


### What is the expected behavior?

_Describe how the application should behave like. Example:_

1. Begin of the insertion**if the parent hasEnd of the insertion Begin of the deletion DisplayEnd of the deletion both Begin of the insertiona start and a finish date**, then makeEnd of the insertion Begin of the deletion work packages inEnd of the deletion the Begin of the insertionchild dates matchEnd of the insertion Begin of the deletion view forEnd of the deletion the Begin of the insertionparent datesEnd of the insertion Begin of the deletion assigned user.End of the deletion


###

**OpenProject installation type**

* [x] Hosted cloud edition
* [ ] Packaged installation
* What distribution?

* [ ] Docker All-in-one container
* [ ] Docker-compose installation
* [ ] Other (please specify)

**OpenProject version**

_If you're not running on the cloud edition, please specify the version of OpenProject you're running. Example: v12.1.5_

**Browser**

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

**Language**

_English_