Will T3 Blank work with Joomla 4?
https://www.t3-framework.org/ - the home page here indicates that it will, but I have tested upgrading a site with T3 Blank to Joomla 4 and the site breaks. The site's home page shows this error:
Cannot access protected property Joomla\CMS\Menu\MenuItem::$params
And references this file
/plugins/system/t3/base/html/mod_menu/default.php:34
These are the T3 extensions installed on the site
T3 Framework, Plugin, 3.1.0, Jul 14, 2022, JoomlArt.com
T3 Framework Package, Package, 2.7.2, July 05, 2018, t3-framework.org
t3_blank, Template, 2.2.7, Sep 06 2017, JoomlArt.com
t3_bs3_blank, Template, 2.3.0, July 05 2018, JoomlArt.com