Steps to reproduce the issue

Use smart search component on the frontend with a test query

Expected result

Show search results

Actual result

0 array_merge() does not accept unknown named parameters

System information (as much as possible)

Joomla 4 Beta 8 - Dev
PHP 8.0 - fpm
NGINX

Additional comments

I have fixed / bypassed error as follows

components/com_finder/src/Model/SearchModel.php line 289

• $include = call_user_func_array('array_merge', $this->includedTerms);

• $include = call_user_func_array('array_merge', array_values($this->includedTerms));