Hello,
just for your information, plg_zentools2_sys_2.3.5 plugin is not compatible with Joomla 4, I get an error when installing and it is no longer possible to use Joomla 4, I had to deactivate the plugin directly in the database.
Thanks,
Lorenzo
EDIT
It seems that Buildr template is not compatible with Joomla 4 ... I thought you updated all Joomlabamboo templates for an update to Joomla 4, what about this major update and Joomlabamboo templates?