posteo.de calendar events are not displayed

[oxidand]

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

1.2.0

Affected Android/Custom ROM version

Android 15 / GrapheneOS

Affected device model

Pixel 7

How did you install the app?

F-Droid / IzzyOnDroid

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

posteo.de

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

DAVx⁵

Steps to reproduce the bug

1. Settings - enable CalDav sync
2. Manage synced calendars - select posteo.de calendar

Expected behavior

• See the events

Actual behavior

All other calendars are displayed, but not the calendar hosted on posteo.de. Another calendar app (Etar) displays the posteo.de calendar correctly.

I don't see any way to get logs to understand why this calendar is not displayed. I can create the events in this calendar, they disappear from the app after saving, but they are correctly synchronised with the server and displayed in the web calendar and in another calendar app. I suspect it might have something to do with some specific event in this calendar, but without access to the logs I can't find the problem.

This has been happening since one of the last updates of SMT Calendar, but I can't remember the exact version. Before that version, the calendar was displayed in the app.

Screenshots/Screen recordings

No response

Additional information

Perhaps you could add an option to view the logs?