### Steps to reproduce

1. Login as a user with notifications

2. Go to the notification center

3. Leave the notif center open without interacting with it

4. Come back to the page


### What is the buggy behavior?

* NetworkError is shown Begin of the insertion


End of the insertion Begin of the deletion



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

1. No error is displayed


### Screenshots and other files

<figure class="image op-uc-figure"><div class="op-uc-figure--content"><img class="op-uc-image" src="/api/v3/attachments/221256/content"></div></figure>

Begin of the insertion###End of the insertion <img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/221262/content"> Begin of the insertion

Note

After leaving the page open overnight and coming back to it, there were more errors and different ones
<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/223207/content">End of the insertion

### Environment information

**OpenProject version**

Core build

[ddb9bd551e36c950cf77bd089f814d1e53213f9b](https://github.com/opf/openproject/commits/ddb9bd551e36c950cf77bd089f814d1e53213f9b)

Product version

[53279a5496dd28cb2fc107a8a6e495057d3ceae1](https://github.com/opf/saas-openproject/commits/53279a5496dd28cb2fc107a8a6e495057d3ceae1)

Core version

OpenProject 15.0.0

**Browser**

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

**Operating System**

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