Calendar Export : Skipping calendar containing invalid calendar data

[acazenave]

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Steps to reproduce

1. php occ user:export USERNAME /tmp/ -t calendar -vvv
   Defaulted container "app" out of: app, web
   Exporting user information in user.json…
   Exporting settings in settings.json…
   Exporting versions in versions.json…
   Exporting calendars into dav/calendars/…
   Skipping calendar "USERNAME" containing invalid calendar data
   Skipping calendar "Anniversaires des contacts" containing invalid calendar data
   Skip non-selected migrator: contacts
   Skip non-selected migrator: trashbin
   Skip non-selected migrator: forms
   Skip non-selected migrator: passwords
   Skip non-selected migrator: account
   Skip non-selected migrator: files
   Export saved in /tmp/USERNAME_2024-10-21_09-27-55.zip

Expected behavior

Calendar should be exported successfully.

Actual behavior

1. Failing to export calendar with error "containing invalid calendar data" : It doesn't explain which data is invalid and why.
2. Even with '-vvv' option, log is not more verbose.

The export of this same calendar in web (through the UI in calendar app) works well.

Server configuration

Web server: Nginx

Database: PostgreSQL

PHP version: 8.2.23

Nextcloud version: 28.0.10

List of activated apps

- user_migration: 5.0.0

[acazenave]

I also have this issue when calendar is empty (but that's not really disturbing).
But I also have it for some calendars that are not empty, and log is not verbose enough to make me understand why.

[Pytal]

Could you provide the .ics file of the calendar which exports successfully via web but not the command?