Stuck on 24 hour clock - need AM/PM

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Describe the bug
Deck is defaulting to a 24 hour clock. It is not setup that way in Nextcloud calendar. I am unsure where this is pulling from and need to change it to a 12 hour clock.

Is this a bug / built in hardwire or is this changeable somewhere? Cannot find it.

Screenshots
Created a short video to better highlight the issue:

• https://www.youtube.com/watch?v=7ATmvK2wvYk

Operating system: Ubuntu 20.04

Web server: Linux

Database: Mysql

PHP version: 7.2

Nextcloud version: (see Nextcloud admin page) 20

Where did you install Nextcloud from: Source

Signing status:

Login as admin user into your Nextcloud and access
http://example.com/index.php/settings/integrity/failed
paste the results here.

No errors have been found.

List of activated apps:

Accessibility
Calendar Collaborative tags Comments Community Document Server Contacts Interaction Custom CSS Dashboard Deck Deleted files Federation  File sharing First run wizard Group folders LDAP user and group backend Log Reader Monitoring Nextcloud announcements Notifications Notifications for calendar event updates ONLYOFFICE Password policy PDF viewer Photos Privacy Recommendations Right click Share by mail Support Text Theming Update notification Usage survey User status Versions Video player Weather status 

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your Nextcloud installation folder

Nextcloud configuration:

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your Nextcloud installation folder

or

Insert your config.php content here
Make sure to remove all sensitive content such as passwords. (e.g. database password, passwordsalt, secret, smtp password, …)

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "cloud.compumatter.biz"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "20.0.6.1",
        "overwrite.cli.url": "https:\/\/cloud.compumatter.biz",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "onlyoffice": {
            "verify_peer_off": true
        },
        "maintenance": false,
        "theme": "",
        "loglevel": 2,
        "ldapIgnoreNamingRules": false,
        "ldapProviderFactory": "OCA\\User_LDAP\\LDAPProviderFactory",
        "mail_smtpmode": "smtp",
        "mail_smtpsecure": "tls",
        "mail_sendmailmode": "smtp",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtpauth": 1,
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "587",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***"
    }
}

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/...
LDAP

Reproduce the 24-hour clock in Deck using the reported Nextcloud 20 setup and compare it with the calendar time-format setting. Trace where Deck obtains and displays the time, then confirm that the display follows the expected 12-hour preference without changing unrelated date or time behavior.