Steps to reproduce the issue

Try to store a new tag in com_tags.

Expected result

The tag is stored

Actual result

An error has occurred.

0 Too few arguments to function PlgContentJoomla::onContentBeforeSave(), 3 passed in D:\xampp\htdocs\joomla-fork\libraries\src\Plugin\CMSPlugin.php on line 287 and exactly 4 expected

System information (as much as possible)

PHP Built On Windows NT DESKTOP-STILS1K 10.0 build 17134 (Windows 10) i586
Database Type mysql
Database Version 5.5.5-10.1.35-MariaDB
Database Collation utf8mb4_unicode_ci
Database Connection Collation utf8_general_ci
PHP Version 7.2.9
Web Server Apache/2.4.34 (Win32) OpenSSL/1.1.0i PHP/7.2.9
WebServer to PHP Interface apache2handler
Joomla! Version Joomla! 4.0.0-alpha7-dev Development [ Amani ] 27-December-2018 17:58 GMT

Additional comments