### Steps to reproduce

1. Login as a user with meeting permissions

2. Click on the upper right waffle menu and select Meetings

3. Click on the upper right 3 dot menu

4. Click on subscribe to Calendar

5. Add link to your email client

6. On OP, make some changes (like removing yourself from the list of attendants of a recurring meeting template as well as upcoming Begin of the insertionoccurrences)

or

wait for new occurences of recurring meetings to be instantiatedEnd of the insertion Begin of the deletion occurences)End of the deletion


### What is the buggy behaviour?

* Calendar does not update on the email client (even after synchronising)


### What is the expected behaviour?

1. Calendar updates on the email client


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### Screenshots

The communicator meetings should not be there on the below screenshot (removed myself from the template and the occurences)

<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/779634/content"> Begin of the insertion
new meeting occurences were instantiated
<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/779650/content">End of the insertion

Begin of the insertionCalendar not updated

<img class="op-uc-image op-uc-image_inline" src="/api/v3/attachments/779651/content">

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End of the insertion ### Environment information

**OpenProject version**

16.4

**Browser**

* [ ] 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)