Error 500 on Panel (Nginx, PHP 7.3)

This is another configuration from Bastian

# site links
location /
{
        try_files $uri $uri/ /index.php$is_args$args;
}

# pass the PHP scripts to FastCGI server listening on the php-fpm socket
location ~ \.php$ {
        try_files $uri = 404;
        fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
}

Maybe try that (changing the path to your php version), don’t know what exactly these little differences do…