Recurring daily events end one day before

Steps to reproduce

1. In the Calendar App click on a time slot to create a new entry (lets say Monday 10:00)
   2.In the pane opening on the right enter the title and on the bottom edit the recurring options (sorry I use a german version, there its saying "Keine Wiederholung")
2. On recurring ("Wiederholung") choose daily ("Tag")
3. At stop ("Wiederholung beenden") choose date ("Am Datum")
4. Choose the date of the friday thats following your chosen monday
5. Choose Save

Expected behavior

Recurring Event from Monday to Friday

Actual behaviour

Recurring Event from Monday to Thursday

Calendar app version

4.6.5 (happens since a long time an lots of version ins the past)

CalDAV-clients used

• none - WebFrontent of NextCloud

Browser

Firefox 115.6 (Debian 12 Current Package)

Client operating system

Debian 12

Server operating system

Debian 11

Web server

Apache

Database engine version

MariaDB

PHP engine version

PHP 7.4

Nextcloud version

25.0.13

Updated from an older installed version or fresh install

Updated from an older version

List of activated apps

Enabled:
  - activity: 2.17.0
  - admin_audit: 1.15.0
  - bruteforcesettings: 2.5.0
  - calendar: 4.6.5
  - circles: 25.0.0
  - cloud_federation_api: 1.8.0
  - comments: 1.15.0
  - contacts: 5.5.1
  - cookbook: 0.10.5
  - dashboard: 7.5.0
  - dav: 1.24.0
  - deck: 1.8.8
  - federatedfilesharing: 1.15.0
  - federation: 1.15.0
  - files: 1.20.1
  - files_pdfviewer: 2.6.0
  - files_rightclick: 1.4.0
  - files_sharing: 1.17.0
  - files_trashbin: 1.15.0
  - files_versions: 1.18.0
  - firstrunwizard: 2.14.0
  - logreader: 2.10.0
  - lookup_server_connector: 1.13.0
  - mail: 2.2.9
  - nextcloud_announcements: 1.14.0
  - notes: 4.9.2
  - notifications: 2.13.1
  - oauth2: 1.13.1
  - password_policy: 1.15.0
  - phonetrack: 0.7.6
  - photos: 2.0.1
  - privacy: 1.9.0
  - provisioning_api: 1.15.0
  - recommendations: 1.4.0
  - related_resources: 1.0.4
  - serverinfo: 1.15.0
  - settings: 1.7.0
  - sharebymail: 1.15.0
  - support: 1.8.0
  - survey_client: 1.13.0
  - systemtags: 1.15.0
  - tasks: 0.15.0
  - text: 3.6.0
  - theming: 2.0.1
  - twofactor_backupcodes: 1.14.0
  - updatenotification: 1.15.0
  - user_status: 1.5.0
  - viewer: 1.9.0
  - weather_status: 1.5.0
  - workflowengine: 2.7.0
Disabled:
  - contactsinteraction: 1.3.0
  - encryption
  - files_external
  - richdocuments: 7.1.9
  - suspicious_login
  - twofactor_totp
  - user_ldap

Nextcloud configuration

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "hinderuex.ch",
            "www.hinderuex.ch"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "25.0.13.2",
        "overwrite.cli.url": "https:\/\/www.hinderuex.ch",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "default_phone_region": "CH",
        "memcache.local": "\\OC\\Memcache\\APCu",
        "mail_smtpmode": "smtp",
        "mail_smtpsecure": "ssl",
        "mail_sendmailmode": "smtp",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauthtype": "PLAIN",
        "mail_smtpauth": 1,
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "465",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "maintenance": false,
        "theme": "",
        "loglevel": 2
    }
}

Web server error log

No response

Log file

No response

Browser log

No response

Additional info

No response

Start by reproducing the issue in the Calendar App web frontend using a daily event from Monday through a Friday stop date. Trace where the recurring options are saved and interpreted, then verify that the final Friday occurrence is included and repeat the reproduction after the change.