Private shared calendar entry is not displayed even when shared with write permissions

[Stanload]

Steps to reproduce

1. Create a calendar and share it with someone in the same Nextcloud instance.
2. Import the following ICS file (upload as TXT file into your own calendar.
   Termine (28947).txt
3. The 6 entries will appear in your own calendar. There are 5 shown here, as the 6th took place in the penultimate week of August.

4. These entries are not shared in the other person’s shared calendar.

5. An entry created in the Nextcloud calendar is displayed.

Expected behavior

The imported calendar entry should also be displayed in the shared calendar.

Actual behavior

The imported calendar entry will also appear in the shared calendar.

Calendar app version

6.5.4

Nextcloud version

33.0.8

Additional info

It seems that the ics file contains something that the (shared) calendar is unable to interpret correctly.

[GVodyanov]

Hey! I was able to reproduce this, if you feel like making a PR for this we are here to help.

[Stanload]

Hey! I was able to reproduce this, if you feel like making a PR for this we are here to help.

What is a PR?
Sorry, I'm new here. I'm not a developer; I'm an end user.

[odzhychko]

I could reproduce it. Even when shared with "can edit and see confidential events" the private events from the provided file are not shown.