diff --git a/wp-includes/sitemaps/class-wp-sitemaps-registry.php b/wp-includes/sitemaps/class-wp-sitemaps-registry.php
index f4aec2f41a..5cb2e2fa45 100644
--- a/wp-includes/sitemaps/class-wp-sitemaps-registry.php
+++ b/wp-includes/sitemaps/class-wp-sitemaps-registry.php
@@ -25,19 +25,32 @@ class WP_Sitemaps_Registry {
 	private $providers = array();
 
 	/**
-	 * Adds a sitemap with route to the registry.
+	 * Adds a new sitemap provider.
 	 *
 	 * @since 5.5.0
 	 *
 	 * @param string               $name     Name of the sitemap provider.
 	 * @param WP_Sitemaps_Provider $provider Instance of a WP_Sitemaps_Provider.
-	 * @return bool True if the provider was added, false if it is already registered.
+	 * @return bool Whether the provider was added successfully.
 	 */
 	public function add_provider( $name, WP_Sitemaps_Provider $provider ) {
 		if ( isset( $this->providers[ $name ] ) ) {
 			return false;
 		}
 
+		/**
+		 * Filters the sitemap provider before it is added.
+		 *
+		 * @since 5.5.0
+		 *
+		 * @param WP_Sitemaps_Provider $provider Instance of a WP_Sitemaps_Provider.
+		 * @param string               $name     Name of the sitemap provider.
+		 */
+		$provider = apply_filters( 'wp_sitemaps_add_provider', $provider, $name );
+		if ( ! $provider instanceof WP_Sitemaps_Provider ) {
+			return false;
+		}
+
 		$this->providers[ $name ] = $provider;
 
 		return true;
diff --git a/wp-includes/sitemaps/class-wp-sitemaps.php b/wp-includes/sitemaps/class-wp-sitemaps.php
index 01f1bf8b35..ff79d711f2 100644
--- a/wp-includes/sitemaps/class-wp-sitemaps.php
+++ b/wp-includes/sitemaps/class-wp-sitemaps.php
@@ -110,29 +110,12 @@ class WP_Sitemaps {
 	 * @since 5.5.0
 	 */
 	public function register_sitemaps() {
-		/**
-		 * Filters the list of registered sitemap providers.
-		 *
-		 * @since 5.5.0
-		 *
-		 * @param array $providers {
-		 *     Array of WP_Sitemaps_Provider objects keyed by their name.
-		 *
-		 *     @type WP_Sitemaps_Posts      $posts      The WP_Sitemaps_Posts object.
-		 *     @type WP_Sitemaps_Taxonomies $taxonomies The WP_Sitemaps_Taxonomies object.
-		 *     @type WP_Sitemaps_Users      $users      The WP_Sitemaps_Users object.
-		 * }
-		 */
-		$providers = apply_filters(
-			'wp_sitemaps_register_providers',
-			array(
-				'posts'      => new WP_Sitemaps_Posts(),
-				'taxonomies' => new WP_Sitemaps_Taxonomies(),
-				'users'      => new WP_Sitemaps_Users(),
-			)
+		$providers = array(
+			'posts'      => new WP_Sitemaps_Posts(),
+			'taxonomies' => new WP_Sitemaps_Taxonomies(),
+			'users'      => new WP_Sitemaps_Users(),
 		);
 
-		// Register each supported provider.
 		/* @var WP_Sitemaps_Provider $provider */
 		foreach ( $providers as $name => $provider ) {
 			$this->registry->add_provider( $name, $provider );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index c0698543d6..dd0448b8f0 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-beta2-48542';
+$wp_version = '5.5-beta2-48543';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.