### Steps to reproduce

1. Login as a user with permissions of a system admin.

2. Go to the Gantt module

3. Click on an existing workpackage (type: phase) the Gantt chart with start and finish date. This work package should have a child work package (type: task). Then create a predecessor relation and select a work package with start and finish date and Begin of the insertionasEnd of the insertion Begin of the deletion alsEnd of the deletion a child work package (type: task), which is dated earlier (see gif).

4. Change the finish date of the predecessor work package to create a conflict between the start of the Begin of the insertionfollowingEnd of the insertion Begin of the deletion follwoingEnd of the deletion work package and the end date of the predecessor.


### What is the buggy behavior?

* The successor will not move to the future.

<br>


### What is the expected behavior?

1. The successor should move to the future.


> ### [Screenshots](https://nextcloud.openproject.org/s/m2LamzB7JMP87YL)&nbsp;

> https://nextcloud.openproject.org/s/m2LamzB7JMP87YL

**Browser**

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

**Operating System**

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

**Language**
German and English