### Steps to reproduce

1. Login as a user with permissions to edit work packages and meetings

2. Go to Meetings and add a work package to the agenda of a meeting

3. Go to the same work package which has been added to the agenda and delete this work package

4. Go to the meeting agenda again


### What is the buggy behavior?

* The work package which has been deleted is still visible in the agenda but crossed out

* The work package cannot be removed from the agenda


### What is the expected behavior?

1. The work package which has been deleted should be removable from the meeting Begin of the insertionagenda

2. You can also edit the agenda item and select a different work packageEnd of the insertion Begin of the deletion agenda End of the deletion


### Screenshots and other files

<img class="image_resized op-uc-image op-uc-image_inline" style="width:1042px;" src="/api/v3/attachments/796590/content">

### Environment information

**OpenProject installation type**

* Hosted cloud edition

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