Remove login form stopped working

Hello! I have had this code

add_filter( 'jetpack_remove_login_form', '__return_true' );

in the functions.php file under the child theme for a while now, and it was working perfectly until recently. However, I was logged out from my site and noticed that the login form was showing on the wp-admin page. I checked if the code was still in functions.php, and it is, so I’m not sure why it’s not hiding the form.