I just upgraded to PHP 8.0, and I get this error:
ErrorException: Template error: [E_WARNING] Array to string conversion src/XF.php:1143
#0 src/XF.php(1143): XF\Template\Templater->handleTemplateError(2, '[E_WARNING] Arr...', '/home/gaturro/p...', 1143)
#1 src/XF/Template/Templater.php(1176)...