Event attendees are not saved to CalDAV account

[lateralus123]

Checklist

• I can reproduce the bug with the latest version given here.
• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• This issue contains only one bug.
• I have read and understood the contribution guidelines.

Affected app version

1.6.2

Affected Android/Custom ROM version

Android 13

Affected device model

Fairphone 4

How did you install the app?

Google Play Store

Which calendar service or provider do you use, if any?

mailbox.org

Which sync adapter app do you use for calendar synchronization, if any?

DAVx5

Steps to reproduce the bug

1. Create a new event in Fossify Calendar

2. Add an attendee

3. Save the event

4. Check the event in mailbox.org web calendar

Expected behavior

Attendee is listed

Actual behavior

attendee is missing

Screenshots/Screen recordings

Additional information

No response