Почему nginx+php-fpm скрипты скачиваются, а не выполняются?

server {
	listen 80 default_server;
	listen [::]:80 default_server;

        root /var/www/html;

	# Add index.php to the list if you are using PHP
	index index.php index.html index.htm index.nginx-debian.html;

	server_name 192.168.0.20;

	location / {
		# First attempt to serve request as file, then
		# as directory, then fall back to displaying a 404.
		try_files $uri $uri/ =404;
	}

	location ~ \.php$ {
		include snippets/fastcgi-php.conf;
	#
	#	# With php-fpm (or other unix sockets):
		fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
	#	# With php-cgi (or other tcp sockets):
	#	fastcgi_pass 127.0.0.1:9000;
	}
	location ~ /\.ht {
		deny all;
	}
}