Thank you for your responses. After a bit of testing, I hooked onto WP (https://developer.wordpress.org/reference/hooks/wp/) which occurs near the end of the WordPress loading sequence, and it is now working:
function wf_lang_query_check() {
global $wp_query, $post;
$lang = wf_get_lang();
if ( ( !is_admin() && $wp_query->is_main_query() ) && ( $lang && ( !in_array( $lang, wf_valid_lang() ) || !wf_check_if_has_translations($post->ID, $lang ) ) ) ):
$wp_query->set_404();
status_header( 404 );
endif;
}
add_action( 'wp', 'wf_lang_query_check' );
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