Calendar is Not Displayed Correctly When Assigning a Date

[ghost]

Steps to reproduce

1. Click a task.
2. Click start or due time.
3. Click the calendar icon to open the calendar.

Expected behaviour

The calendar is not overlapped.

Actual behaviour

The calendar is overlapped with the task list. I will have to zoom out to 70% to see Sunday.

Server configuration detail

Operating system: Linux 5.9.13-postmarketos-qcom-msm8974 #1 SMP PREEMPT Mon Dec 14 08:37:25 UTC 2020 armv7l

Webserver: nginx/1.18.0 (fpm-fcgi)

Database: mysql 10.5.8

PHP version:

7.4.14
Modules loaded: Core, date, libxml, pcre, zlib, filter, hash, readline, Reflection, SPL, session, cgi-fcgi, bcmath, bz2, ctype, curl, dom, fileinfo, gd, gmp, iconv, intl, json, mbstring, openssl, pcntl, PDO, posix, standard, SimpleXML, sqlite3, xml, xmlwriter, zip, mysqlnd, xmlreader, mysqli, pdo_mysql, apcu, imagick, Zend OPcache

Nextcloud version: 20.0.4 - 20.0.4.0

Updated from an older Nextcloud/ownCloud or fresh install: Updated from older version.

Where did you install Nextcloud from: Nextcloud official download page.

Signing status

Array
(
)

List of activated apps

Enabled:
 - accessibility: 1.6.0
 - audioplayer: 3.0.0
 - bookmarks: 4.0.8
 - bruteforcesettings: 2.0.1
 - calendar: 2.1.3
 - checksum: 1.0.1
 - cloud_federation_api: 1.3.0
 - comments: 1.10.0
 - contacts: 3.4.3
 - contactsinteraction: 1.1.0
 - dashboard: 7.0.0
 - dav: 1.16.2
 - federatedfilesharing: 1.10.2
 - files: 1.15.0
 - files_external: 1.11.1
 - files_pdfviewer: 2.0.1
 - files_rightclick: 0.17.0
 - files_sharing: 1.12.1
 - files_versions: 1.13.0
 - files_videoplayer: 1.9.0
 - firstrunwizard: 2.9.0
 - issuetemplate: 0.7.0
 - logreader: 2.5.0
 - lookup_server_connector: 1.8.0
 - news: 15.1.1
 - nextcloud_announcements: 1.9.0
 - notes: 4.0.2
 - notifications: 2.8.0
 - oauth2: 1.8.0
 - password_policy: 1.10.1
 - passwords: 2020.12.2
 - photos: 1.2.1
 - privacy: 1.4.0
 - provisioning_api: 1.10.0
 - recommendations: 0.8.0
 - serverinfo: 1.10.0
 - settings: 1.2.0
 - survey_client: 1.8.0
 - systemtags: 1.10.0
 - tasks: 0.13.6
 - text: 3.1.0
 - theming: 1.11.0
 - twofactor_backupcodes: 1.9.0
 - updatenotification: 1.10.0
 - user_status: 1.0.1
 - viewer: 1.4.0
 - weather_status: 1.0.0
 - workflowengine: 2.2.0
Disabled:
 - activity
 - admin_audit
 - encryption
 - federation
 - files_trashbin
 - sharebymail
 - support
 - user_ldap

Configuration (config/config.php)

{
    "passwordsalt": "***REMOVED SENSITIVE VALUE***",
    "secret": "***REMOVED SENSITIVE VALUE***",
    "trusted_domains": [
        "***REMOVED SENSITIVE VALUE***""
    ],
    "datadirectory": "***REMOVED SENSITIVE VALUE***",
    "dbtype": "mysql",
    "version": "20.0.4.0",
    "overwrite.cli.url": "http:\/\/localhost",
    "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***",
    "default_language": "ja_JP",
    "default_locale": "ja_JP",
    "memcache.local": "\\OC\\Memcache\\APCu",
    "maintenance": false,
    "theme": "",
    "loglevel": 2
}

Client configuration

Browser: Mozilla/5.0 (Windows NT 10.0; rv:78.0) Gecko/20100101 Firefox/78.0

Operating system: openSUSE 15.2

Logs

Web server error log

(No error occurred.)

Nextcloud log

(Not logged.)

Browser log

(I don't know how to get it. I will paste it in need.)

Screenshot

[raimund-schluessler]

Duplicate of #935.