Steps to reproduce the issue

Upgrade a core version of Joomla 3.5.0 beta2 by using the installer to install the new version 3.5.0 beta3

Expected result

No errors

Actual result

Error in Database check.

System information (as much as possible)

PHP Built On Windows NT DESKTOP-A55DI1C 6.2 build 9200 (Windows 8 Professional Edition) i586
Database Version 5.5.5-10.1.9-MariaDB
Database Collation utf8_general_ci
Database Connection Collation utf8mb4_general_ci
PHP Version 5.6.15
Web Server Apache/2.4.17 (Win32) OpenSSL/1.0.2d PHP/5.6.15
WebServer to PHP Interface apache2handler
Joomla! Version Joomla! 3.5.0-beta3 Beta [ Ember ] 28-February-2016 23:00 GMT
Joomla! Platform Version Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT
User Agent Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.116 Safari/537.36

Additional comments

After installing the upgrade, I checked to see if anything was to be found under "Discover" then I checked the Database Tab and found the following error message:

Warning Database is not up to date!
1 Database Problem Found
. The Joomla! Core databse tables have not been converted yet to UTF-8 Multibyte (utf8mb4)

I used the "Fix" button and that solved the problem. Maybe this is nothing, but I thought I'd report it.