### Steps to reproduce

1. Confirm current aggregation period in Admin Begin of the insertion> Email and notifications > AggregationEnd of the insertion settings Begin of the insertionbeing set (5 minutes for instance)End of the insertion

2. Modify something about a work package (anything besides the description) Begin of the insertion

1. assign a work package to another user

End of the insertion Begin of the deletion

End of the deletion 3. Within the aggregation period, add a comment and Begin of the insertionmentionEnd of the insertion Begin of the deletion @End of the deletion a Begin of the insertionuser (@someone syntax).

1. mention the user who was assigned at step 2.


End of the insertion Begin of the deletion user.


End of the deletion ### What is the buggy behavior?

* Mention'd user will not receive an email about the mention.

* Assuming this is because the actions (because of the aggregation settings) gets squashed into one activity and the mention gets forgotten about.

* Even after the aggregation period, there is no email notification.


### What is the expected behavior?

1. Mention'd user should receive an email about the mention


### Environment information

_Please check and fill out the following details to help us identify in what versions and distributions of OpenProject the error occurs_

**OpenProject installation type**

* Begin of the deletion [x]End of the deletion Hosted cloud edition Begin of the insertion

End of the insertion Begin of the deletion
End of the deletion * Begin of the deletion [ ]End of the deletion Packaged installation Begin of the insertion

End of the insertion Begin of the deletion
End of the deletion * What distribution?

* Begin of the deletion [ ]End of the deletion Docker All-in-one container Begin of the insertion

End of the insertion Begin of the deletion
End of the deletion * Begin of the deletion [ ]End of the deletion Docker-compose installation Begin of the insertion

End of the insertion Begin of the deletion
End of the deletion * Begin of the deletion [ ]End of the deletion Other (please specify) Begin of the insertion


End of the insertion Begin of the deletion

End of the deletion **OpenProject version**

_14.3.0_

**Browser**

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

**Language**

_English_