View of month does not show all entries

Steps to reproduce

1. Open Nextcloud Calendar App
2. Have more than 3 "All Day" entries for one day
3. Switch from weekly view to monthly view
4. Click "# More"

Expected behavior

All entries from all shown calendars shoud be correctly summarized and shown when clicking on "# More". All other views (weekly, daly or list) work as expected.

Actual behaviour

Not all entries are correctly summarized, e.g. some entries will be ignored. When clicking on "# More" some entries are not shown, which should be shown.
No data loss. All entries are visible on external calendar app, like Thunderbird or such. All entries are shown when clicking on weekly view.


Weekly view

Calendar app version

No response

CalDAV-clients used

Thunderbird, DAVx5

Browser

Firefox 120.0.1

Client operating system

Windwos 10

Server operating system

Ubuntu 22.04.3 LTS

Web server

Apache

Database engine version

PostgreSQL

PHP engine version

PHP 8.1

Nextcloud version

27.1.4

Updated from an older installed version or fresh install

None

List of activated apps

Enabled:
  - activity: 2.19.0
  - admin_audit: 1.17.0
  - bruteforcesettings: 2.7.0
  - calendar: 4.6.0
  - circles: 27.0.1
  - cloud_federation_api: 1.10.0
  - comments: 1.17.0
  - contacts: 5.5.0
  - contactsinteraction: 1.8.0
  - dashboard: 7.7.0
  - dav: 1.27.0
  - deck: 1.11.2
  - drawio: 2.1.4
  - event_update_notification: 2.3.0
  - federatedfilesharing: 1.17.0
  - federation: 1.17.0
  - files: 1.22.0
  - files_antivirus: 5.4.0
  - files_fulltextsearch: 27.0.1
  - files_pdfviewer: 2.8.0
  - files_reminders: 1.0.0
  - files_rightclick: 1.6.0
  - files_sharing: 1.19.0
  - files_trashbin: 1.17.0
  - files_versions: 1.20.0
  - files_zip: 1.4.0
  - firstrunwizard: 2.16.0
  - fulltextsearch: 27.0.3
  - fulltextsearch_elasticsearch: 27.0.5
  - groupfolders: 15.3.1
  - integration_dropbox: 2.1.0
  - integration_openproject: 2.5.1
  - logreader: 2.12.0
  - lookup_server_connector: 1.15.0
  - nextcloud-aio: 0.4.0
  - nextcloud_announcements: 1.16.0
  - notifications: 2.15.0
  - notify_push: 0.6.6
  - oauth2: 1.15.1
  - password_policy: 1.17.0
  - privacy: 1.11.0
  - provisioning_api: 1.17.0
  - quicknotes: 0.8.10
  - recommendations: 1.6.0
  - related_resources: 1.2.0
  - richdocuments: 8.2.3
  - serverinfo: 1.17.0
  - settings: 1.9.0
  - sharebymail: 1.17.0
  - spreed: 17.1.3
  - support: 1.10.0
  - survey_client: 1.15.0
  - suspicious_login: 5.0.0
  - systemtags: 1.17.0
  - tasks: 0.15.0
  - text: 3.8.0
  - theming: 2.2.0
  - twofactor_backupcodes: 1.16.0
  - twofactor_totp: 9.0.0
  - user_status: 1.7.0
  - viewer: 2.1.0
  - weather_status: 1.7.0
  - workflowengine: 2.9.0
Disabled:
  - apporder: 0.15.0 (installed 0.15.0)
  - encryption: 2.15.0
  - files_external: 1.19.0
  - photos: 2.3.0 (installed 2.3.0)
  - user_ldap: 1.17.0

Nextcloud configuration

{
    "system": {
        "memcache.local": "\\OC\\Memcache\\APCu",
        "apps_paths": [
            {
                "path": "\/var\/www\/html\/apps",
                "url": "\/apps",
                "writable": false
            },
            {
                "path": "\/var\/www\/html\/custom_apps",
                "url": "\/custom_apps",
                "writable": true
            }
        ],
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "password": "***REMOVED SENSITIVE VALUE***",
            "port": 6379
        },
        "overwritehost": "nextcloud.intern.example.com",
        "overwriteprotocol": "https",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "localhost",
            "nextcloud.intern.example.com"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "pgsql",
        "version": "27.1.4.1",
        "overwrite.cli.url": "https:\/\/nextcloud.intern.example.com\/",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "loglevel": "2",
        "log_type": "file",
        "logfile": "\/var\/www\/html\/data\/nextcloud.log",
        "log_rotate_size": "10485760",
        "log.condition": {
            "apps": [
                "admin_audit"
            ]
        },
        "preview_max_x": "2048",
        "preview_max_y": "2048",
        "jpeg_quality": "60",
        "enabledPreviewProviders": {
            "1": "OC\\Preview\\Image",
            "2": "OC\\Preview\\MarkDown",
            "3": "OC\\Preview\\MP3",
            "4": "OC\\Preview\\TXT",
            "5": "OC\\Preview\\OpenDocument",
            "6": "OC\\Preview\\Movie",
            "0": "OC\\Preview\\Imaginary"
        },
        "enable_previews": true,
        "upgrade.disable-web": true,
        "mail_smtpmode": "smtp",
        "trashbin_retention_obligation": "auto, 30",
        "versions_retention_obligation": "auto, 30",
        "activity_expire_days": "30",
        "simpleSignUpLink.shown": false,
        "share_folder": "\/Shared",
        "one-click-instance": true,
        "one-click-instance.user-limit": 100,
        "one-click-instance.link": "https:\/\/nextcloud.com\/all-in-one\/",
        "htaccess.RewriteBase": "\/",
        "files_external_allow_create_new_local": false,
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "allow_local_remote_servers": true,
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_sendmailmode": "smtp",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpsecure": "tls",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtpauth": 1,
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "587",
        "preview_imaginary_url": "http:\/\/nextcloud-aio-imaginary:9000",
        "default_phone_region": "DE",
        "maintenance": false,
        "updatedirectory": "\/nc-updater",
        "upgrade.cli-upgrade-link": "https:\/\/github.com\/nextcloud\/all-in-one\/discussions\/2726",
        "davstorage.request_timeout": 3600,
        "dbpersistent": false,
        "data-fingerprint": "fca2a75cb5843e876071ff3044562d64",
        "appsallowlist": []
    }
}

Web server error log

No response

Log file

No response

Browser log

No response

Additional info

No response

Reproduce the issue in the Calendar app's monthly view with more than three all-day entries on one day, then click "# More" and compare the result with weekly and list views. Done means every entry from all shown calendars appears in the monthly overflow list; the report names no source file or test to start from.