After updating to Nextcloud 22.2.3, Upcoming Events Empty and Create A New Event Does Not Work.

[worksmarter]

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Steps to reproduce

1. Update to 22.2.3

Expected behavior

Upcoming Events Should be populated from Calendar.
Create A New Event Should work as normal.

Actual behavior

Upcoming Events Not Populated on Dashboard
Create A New Event From Upcoming Events On Dashboard hangs on page with "Page Unresponsive"

Server configuration

Operating system:
CentOS 7
Operating system: Linux 3.10.0-1160.45.1.el7.x86_64 nextcloud/server#1 SMP Wed Oct 13 17:20:51 UTC 2021 x86_64

Webserver: Apache/2.4.51 (Unix) OpenSSL/1.0.2k-fips (fpm-fcgi)

Database: mysql 10.2.41

PHP version: 8.0.12

Modules loaded: Core, date, libxml, openssl, pcre, sqlite3, zlib, bcmath, bz2, calendar, ctype, curl, dom, hash, fileinfo, filter, ftp, gd, gettext, gmp, SPL, iconv, session, intl, json, ldap, mbstring, standard, mysqlnd, pcntl, mysqli, PDO, pdo_mysql, pdo_sqlite, Phar, posix, pspell, Reflection, imap, shmop, SimpleXML, soap, sockets, exif, sysvmsg, sysvsem, sysvshm, tidy, tokenizer, xml, xmlreader, xmlwriter, xsl, zip, cgi-fcgi, apcu, brotli, imagick, mailparse, mcrypt, memcache, memcached, redis, sodium, ssh2, uploadprogress, Zend OPcache

Nextcloud version: 22.2.3 - 22.2.3.0

Updated from an older Nextcloud: 22.2.2

Where did you install Nextcloud from: online updater

Signing status

``` Login as admin user into your Nextcloud and access http://example.com/index.php/settings/integrity/failed No errors have been found. ```

List of activated apps

Enabled:
 - accessibility: 1.8.0
 - activity: 2.15.0
 - apporder: 0.13.0
 - calendar: 2.3.4
 - camerarawpreviews: 0.7.13
 - checksum: 1.1.2
 - circles: 22.1.1
 - cloud_federation_api: 1.5.0
 - comments: 1.12.0
 - contacts: 4.0.6
 - contactsinteraction: 1.3.0
 - dashboard: 7.2.0
 - dav: 1.19.0
 - deck: 1.5.5
 - external: 3.9.0
 - federatedfilesharing: 1.12.0
 - federation: 1.12.0
 - files: 1.17.0
 - files_markdown: 2.3.4
 - files_pdfviewer: 2.3.1
 - files_rightclick: 1.1.0
 - files_sharing: 1.14.0
 - files_trashbin: 1.12.0
 - files_versions: 1.15.0
 - files_videoplayer: 1.11.0
 - firstrunwizard: 2.11.0
 - groupfolders: 10.0.0
 - logreader: 2.7.0
 - lookup_server_connector: 1.10.0
 - maps: 0.1.9
 - music: 1.4.1
 - nextcloud_announcements: 1.11.0
 - notes: 4.2.0
 - notifications: 2.10.1
 - oauth2: 1.10.0
 - password_policy: 1.12.0
 - photos: 1.4.0
 - privacy: 1.6.0
 - provisioning_api: 1.12.0
 - rainloop: 7.1.2
 - recommendations: 1.1.0
 - serverinfo: 1.12.0
 - settings: 1.4.0
 - spreed: 12.1.2
 - support: 1.5.0
 - survey_client: 1.10.0
 - tasks: 0.14.2
 - text: 3.3.0
 - theming: 1.13.0
 - twofactor_backupcodes: 1.11.0
 - updatenotification: 1.12.0
 - user_status: 1.2.0
 - viewer: 1.6.0
 - weather_status: 1.2.0
 - workflowengine: 2.4.0
Disabled:
 - admin_audit
 - bruteforcesettings
 - encryption
 - files_external
 - files_trackdownloads
 - mail
 - richdocuments
 - sharebymail
 - systemtags
 - user_ldap

or

Configuration (config/config.php)

{
    "instanceid": "***REMOVED SENSITIVE VALUE***",
    "passwordsalt": "***REMOVED SENSITIVE VALUE***",
    "secret": "***REMOVED SENSITIVE VALUE***",
    "trusted_domains": [
        "my.domain.com"
    ],
    "datadirectory": "***REMOVED SENSITIVE VALUE***",
    "dbtype": "mysql",
    "version": "22.2.3.0",
    "overwrite.cli.url": "https:\/\/vapor.userveit.com",
    "dbname": "***REMOVED SENSITIVE VALUE***",
    "dbhost": "***REMOVED SENSITIVE VALUE***",
    "dbport": "",
    "dbtableprefix": "oc_",
    "mysql.utf8mb4": true,
    "dbuser": "***REMOVED SENSITIVE VALUE***",
    "dbpassword": "***REMOVED SENSITIVE VALUE***",
    "installed": true,
    "integrity.check.disabled": false,
    "memcache.local": "\\OC\\Memcache\\APCu",
    "memcache.locking": "\\OC\\Memcache\\Redis",
    "redis": {
        "host": "***REMOVED SENSITIVE VALUE***",
        "port": 6379
    },
    "theme": "",
    "maintenance": false,
    "mail_domain": "***REMOVED SENSITIVE VALUE***",
    "mail_smtpmode": "sendmail",
    "mail_sendmailmode": "pipe",
    "mail_from_address": "***REMOVED SENSITIVE VALUE***",
    "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
    "mail_smtpport": "25",
    "default_phone_region": "US",
    "loglevel": 3,
    "logdateformat": "F d, Y H:i:s",
    "logtimezone": "America\/New_York",
    "has_internet_connection": true,
    "connectivity_check_domains": [
        "www.nextcloud.com",
        "www.startpage.com",
        "www.eff.org",
        "www.edri.org"
    ],
    "updater.release.channel": "stable",
    "app_install_overwrite": [
        "rainloop"
    ],
    "updater.secret": "***REMOVED SENSITIVE VALUE***"
}

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

Are you using external storage, if yes which one: local/smb/sftp/...
No
Are you using encryption: yes/no
No
Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/...
No

### Client configuration
**Browser:**
Chrome, Firefox
**Operating system:**
Windows 10 x64
### Logs

<!--- Nothing to report-->

#### Web server error log: Nothing to report
<details>
<summary>Web server error log</summary>

Insert your webserver log here
Nothing to report

Nextcloud log (data/nextcloud.log)

Nextcloud log

Insert your Nextcloud log here
Nothing to report
</details>

#### Browser log
<details>
<summary>Browser log</summary>

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log
c) ...

</details>

[ChristophWurst]

Dup of #3649