Custom sitemaps for links num more than max_entries but still in one index_links

Hello,

I checked with the devs and they have identified this as a bug. We have logged it and will inform you once we have fixed this.

We really appreciate your patience in the meantime.

Don’t hesitate to get in touch in case you need our assistance with anything else.

Hello,

Thank you for getting back to us.

Unfortunately, we don’t have any ETA for this fix. Rest assured that we will announce it when we release an update to fix the said issue.

You can keep an eye on our changelog to get notified when we release this improvement in an update: https://rankmath.com/changelog/

We appreciate your time and patience on this one.

Hello,

We released a quick Beta update you can try to see if that helps.

Please enable the Beta update by following this:
https://rankmath.com/kb/version-control/#beta-updates

If you are unable to see an update, please clear Rank Math’s transients from:
WP Dashboard > Rank Math > Status & Tools > Database Tools > Remove Rank Math Transients > Remove transients

Please clear the caches, server, and WordPress after updating.

You can disable the Beta updates once you update to the latest version and if the issue is fixed.

We are here to assist. Thank you.

Hello,

Instead of lastmod, please add the date in the mod. Here is the updated code:

<?php
namespace RankMath\Sitemap\Providers;

defined( 'ABSPATH' ) || exit;

class Custom implements Provider {

	public function handles_type( $type ) {
		return 'custom' === $type;
	}

	public function get_index_links( $max_entries ) {
		$links = $this->get_links();
		if ( count( $links ) <= $max_entries ) {
			return [
				[
					'loc'     => \RankMath\Sitemap\Router::get_base_url( 'custom-sitemap.xml' ),
					'lastmod' => '2023-07-31 08:27 +00:00',
				]
			];
		}

		$links = array_chunk( $links, $max_entries );
		$index = [];
		foreach ( $links as $count => $link ) {
			$page = $count + 1;
			$index[] = [
				'loc'     => \RankMath\Sitemap\Router::get_base_url( "custom-sitemap$page.xml" ),
				'lastmod' => $link[ $count ]['mod'],
			];
		}

		return $index;

	}

	public function get_sitemap_links( $type, $max_entries, $current_page ) {
		$links = $this->get_links();

		$offset      = ( $current_page - 1 ) * $max_entries;
		$total_count = count( $links );
		if ( $total_count > $offset ) {
			$new_links = array_slice( $links, $offset, $max_entries );
			return $new_links;
		}
		

		return $links;
	}

	private function get_links() {
		return [
			[ 'loc' => 'http://rankmath.local/test1&#8242', 'mod' => '2023-07-31 08:27 +00:00' ],
			[ 'loc' => 'http://rankmath.local/test2&#8242', 'mod' => '2023-07-29 08:27 +00:00'],
			[ 'loc' => 'http://rankmath.local/test3&#8242', 'mod' => '2023-07-31 08:27 +00:00' ],
			[ 'loc' => 'http://rankmath.local/test4&#8242', 'mod' => '2023-07-31 08:27 +00:00' ],
			[ 'loc' => 'http://rankmath.local/test5&#8242', 'mod' => '2023-07-31 08:27 +00:00' ],
		];
	}
}

Hope that helps.