Meta tags not allowed?

Hello, i activated a theme but i couldn’t see any meta in the head while checking the page source

I checked the code for a little and looks like it’s not allowed in your function “wp_kses_wf($html)” (under-construction.php line 4981)

I added this code and then the meta showed

$allowed_tags['meta'] = array(

            'name' => true,

            'content' => true,

            'charset' => true,

            'http-equiv' => true

        );

was it my problem or does the code actually removes the meta from the html?
apparently you let users add description meta tag so i’m just more confused