ICSx5 synced calendar does not appear in Fossify Calendar

[krc]

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

Graphene OS 16

Affected device model

Pixel 6a

How did you install the app?

F-Droid / IzzyOnDroid

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

Holodex.net 'favorites' calendar

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

ICSx5

Steps to reproduce the bug

1. Install ICSx5
2. Connect it to Holodex.net "favorites" calendar
3. It syncs without error
4. Open Fossify, calendar is not displayed
5. Go to settings -> manage calendars, it is not listed there either

Expected behavior

The synced calendar should be visible.

Actual behavior

Issue #512 seems to indicated it might be in the settings and just need to be activated, but in this case it is not there.

I also have DAVx5 with synced CalDAV calendars (fastmail), they show up just fine.

https://icalendar.org/validator.html shows some errors about valarms not having descriptions, but no other errors, and vevents in the file seem all correct.

Edit:

Just checked the general holodex indie calendar it also does not show up despite syncing correctly in ICSx5

URL: https://holodex.net/live.ics?org=Independents&preferEnglishName=1

Screenshots/Screen recordings

No response

Additional information

No response