Cannot select the first Calendar for an Event

[jackthebean]

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

1.10.3

Affected Android/Custom ROM version

Android 10

Affected device model

Honor View 20

How did you install the app?

F-Droid / IzzyOnDroid

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

Ionos

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

DAVx5

Steps to reproduce the bug

Create an event, select the calendar field to assign it to the relevant calendar and not all calendars are listed. In my case it looks as if only the first one is not and the last 8 are. So I cannot select that first calendar.
If I click Manage Calendars all calendars are shown inc the one which I cannot select for the Event.

Expected behavior

Expect to be able to select any of the calendars for an Event.

Actual behavior

Not able to select the correct calendar when it is the first one.

Can select other ones.

Screenshots/Screen recordings

No response

Additional information

No response