subscribed ics calendar disappeared only on the web interface (but is still working in caldav)

Steps to reproduce

1.Host an .ics file on your Nextcloud instance
2.Share the direct link to the file
3.Add the link to your subscribed calendars
4.The events should show on the Nextcloud web interface, but they don't. If you have another calendar client (for instance phone calendar where you added your Nextcloud calendar), then the events do actually show fine.

Expected behavior

Added calendar should show up on the calendar app web interface of Nextcloud.

Actual behavior

Added calendar does not show in the Nextcloud web interface.

My Nextcloud calendar account is also on my phone calendar app. This works fine.

Calendar app version

5.2.0

CalDAV-clients used

macOS works, iPhone works. Only Nextcloud user interface does not show subscribed calendar.

Browser

does not show on any browser (edge, safari, firefox)

Client operating system

does not work on Windows, linux, nor Mac

Server operating system

debian

Web server

Nginx

Database engine version

MySQL

PHP engine version

Other

Nextcloud version

30.0.8

Updated from an older installed version or fresh install

Updated from an older version

List of activated apps

Enabled:
  - activity: 3.0.0
  - admin_audit: 1.20.0
  - app_api: 4.0.6
  - appointments: 2.4.1
  - bruteforcesettings: 3.0.0
  - calendar: 5.2.0
  - cloud_federation_api: 1.13.0
  - comments: 1.20.1
  - contacts: 7.0.4
  - dashboard: 7.10.0
  - dav: 1.31.1
  - federatedfilesharing: 1.20.0
  - files: 2.2.0
  - files_accesscontrol: 1.20.1
  - files_downloadlimit: 3.0.0
  - files_linkeditor: 1.1.22
  - files_pdfviewer: 3.0.0
  - files_reminders: 1.3.0
  - files_sharing: 1.22.0
  - files_trashbin: 1.20.1
  - files_versions: 1.23.0
  - forms: 5.0.4
  - integration_mastodon: 3.1.1
  - keeweb: 0.6.21
  - logreader: 3.0.0
  - lookup_server_connector: 1.18.0
  - mail: 4.3.3
  - maps: 1.5.0
  - notifications: 3.0.0
  - oauth2: 1.18.1
  - onlyoffice: 9.7.0
  - password_policy: 2.0.0
  - provisioning_api: 1.20.0
  - recommendations: 3.0.0
  - related_resources: 1.5.0
  - serverinfo: 2.0.0
  - settings: 1.13.0
  - sharebymail: 1.20.0
  - systemtags: 1.20.0
  - text: 4.1.0
  - theming: 2.6.0
  - twofactor_backupcodes: 1.19.0
  - twofactor_totp: 12.0.0-dev
  - unsplash: 3.0.3
  - user_ldap: 1.21.0
  - viewer: 3.0.0
  - weather_status: 1.10.0
  - webhook_listeners: 1.1.0-dev
  - workflowengine: 2.12.0
Disabled:
  - calendar_news: 1.1.15 (installed 1.1.15)
  - cfg_share_links: 7.0.1 (installed 7.0.1)
  - circles: 30.0.0 (installed 26.0.0)
  - contactsinteraction: 1.11.0 (installed 1.8.0)
  - encryption: 2.18.0
  - federation: 1.20.0 (installed 1.12.0)
  - files_external: 1.22.0
  - firstrunwizard: 3.0.0 (installed 2.18.0)
  - nextcloud_announcements: 2.0.0 (installed 1.18.0)
  - photos: 3.0.2 (installed 2.3.0)
  - privacy: 2.0.0 (installed 1.8.0)
  - support: 2.0.0 (installed 1.3.0)
  - survey_client: 2.0.0 (installed 1.8.0)
  - suspicious_login: 8.0.0
  - twofactor_nextcloud_notification: 4.0.0
  - updatenotification: 1.20.0 (installed 1.17.0)
  - user_status: 1.10.0 (installed 1.0.1)

Nextcloud configuration

{
    "system": {
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "***REMOVED SENSITIVE VALUE***"
        ],
        "default_phone_region": "",
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "30.0.8.1",
        "overwrite.cli.url": "***REMOVED SENSITIVE VALUE***",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "ldapProviderFactory": "OCA\\User_LDAP\\LDAPProviderFactory",
        "updatechecker": false,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "integrity.check.disabled": true,
        "filelocking.enabled": true,
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": "6379",
            "timeout": "0.0",
            "password": "***REMOVED SENSITIVE VALUE***"
        },
        "hashing_default_password": true,
        "localstorage.allowsymlinks": true,
        "simpleSignUpLink.shown": false,
        "logout_url": "***REMOVED SENSITIVE VALUE***",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_sendmailmode": "smtp",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauth": 1,
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "data-fingerprint": "***REMOVED SENSITIVE VALUE***",
        "maintenance": false,
        "memories.exiftool": "\/var\/www\/nextcloud\/apps\/memories\/bin-ext\/exiftool-aarch64-glibc",
        "memories.vod.path": "\/var\/www\/nextcloud\/apps\/memories\/bin-ext\/go-vod-aarch64",
        "loglevel": 3,
        "mail_smtpport": "25",
        "mail_smtpstreamoptions": {
            "ssl": {
                "allow_self_signed": true,
                "verify_peer": false,
                "verify_peer_name": false
            }
        },
        "maintenance_window_start": 1,
        "logfile": "\/var\/log\/nextcloud\/nextcloud.log",
        "memories.db.triggers.fcu": true,
        "theme": "",
        "app_install_overwrite": [
            "unsplash",
            "keeweb"
        ],
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***"
    }
}

Web server error log

Log file

Browser log

Additional info

php version 8.3.19

Start by reproducing the issue in the Nextcloud Calendar web interface using the listed steps, then compare the subscribed calendar with a CalDAV client where the events appear. No files or tests are identified in the report; done means the subscribed calendar and its events are visible in the web interface without breaking the working CalDAV behavior.