Excluded post types not working anymore

Hello!

Recently, my client’s integration started to index post types which I have excluded with algolia_excluded_post_types.

This is my snippet, which should exclude quite some things:

function mb_blacklist_custom_post_type( array $blacklist ) {
    $blacklist[] = 'employee';
    $blacklist[] = 'book_review';
    $blacklist[] = 'wp_template_part';
    $blacklist[] = 'acf-field';
    $blacklist[] = 'post';
    $blacklist[] = 'wp_navigation';
    $blacklist[] = 'wp_global_styles';
    $blacklist[] = 'acf-field-group';
    $blacklist[] = 'wp_template';
    $blacklist[] = 'user_request';
    $blacklist[] = 'oembed_cache';
    $blacklist[] = 'customize_changeset';
    $blacklist[] = 'custom_css';
    $blacklist[] = 'attachment';
    $blacklist[] = 'page';
    $blacklist[] = 'wp_block';
    $blacklist[] = 'users';

    return $blacklist;
}

add_filter( 'algolia_excluded_post_types', 'mb_blacklist_custom_post_type' );

I tried outputting the $excluded-variable from class-algolia-settings.php, which outputs the following:

[19-Dec-2023 09:01:12 UTC] Excluded:
[19-Dec-2023 09:01:12 UTC] Array
(
    [0] => nav_menu_item
    [1] => employee
    [2] => book_review
    [3] => wp_template_part
    [4] => acf-field
    [5] => post
    [6] => wp_navigation
    [7] => wp_global_styles
    [8] => acf-field-group
    [9] => wp_template
    [10] => user_request
    [11] => oembed_cache
    [12] => customize_changeset
    [13] => custom_css
    [14] => attachment
    [15] => page
    [16] => wp_block
    [17] => users
    [18] => revision
    [19] => custom_css
    [20] => customize_changeset
    [21] => oembed_cache
    [22] => user_request
    [23] => wp_block
    [24] => wp_global_styles
    [25] => wp_navigation
    [26] => wp_template
    [27] => wp_template_part
    [28] => kr_request_token
    [29] => kr_access_token
    [30] => deprecated_log
    [31] => async-scan-result
    [32] => scanresult
)

This is before array_unique(), but as you can see, attachment (14) and page (15) are in the list.

However, whenever the index is running, it’s indexing all media files and all pages. It’s not indexing employee, because that post type has 'exclude_from_search' => true,.

What could be the reason the algolia_excluded_post_types-function suddenly stopped working?