Custom permalink structure gives 40

Hello all,

For a Custom Post Type called matches I created a custom permalink structure. The structure shows up just the way I want it, however, I get a 404 everytime I visit the post.

I have tried removing the .htaccess, re-saving the permalinks, flushing the rewrites etc. None of it did any good.

The code I use is as follows:

add_action( 'init', array( $this, 'match_permalink_structure' ) );
add_filter( 'post_type_link', array( $this, 'better_match_permalinks' ), 10, 3 );

function match_permalink_structure() {
	global $wp_rewrite;

	$structure = trailingslashit( __( 'match', 'apollo' ) );
	$structure .= trailingslashit( '%year%/%month%/%day%' );
	$structure .= trailingslashit( '%matches%' );

	$wp_rewrite->add_rewrite_tag( "%matches%", '([^/]+)', "matches=" );
	$wp_rewrite->add_permastruct( 'matches', $structure, true );
}

function better_match_permalinks( $permalink, $post, $leavename ) {
	$rewritecode = array(
        '%year%',
        '%month%',
        '%day%',
        $leavename ? '' : '%matches%',
    );

	$timestamp = get_field( 'match_datetime', $post->ID );

	if( ! empty( $timestamp ) ) {
		$year = date( 'Y', $timestamp );
		$month = date( 'm', $timestamp );
		$day = date( 'd', $timestamp );
	} else {
		$year = date( 'Y', strtotime( $post->post_date ) );
		$month = date( 'm', strtotime( $post->post_date ) );
		$day = date( 'd', strtotime( $post->post_date ) );
	}

	$rewrite_replace = array(
		$year,
		$month,
		$day,
		$post->post_name,
	);

	$permalink = str_replace( $rewritecode, $rewrite_replace, $permalink );

	return $permalink;
}

Does anyone have any idea what I could possibly be doing wrong, or what I need to do to fix this issue?