Multisite: After creating a new blog, ensure the blog cache is correctly cleaned up.

Props david.binda, spacedmonkey.
Fixes #46125.


Built from https://develop.svn.wordpress.org/trunk@44727


git-svn-id: http://core.svn.wordpress.org/trunk@44558 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/ms-site.php

@@ -723,6 +723,9 @@ function wp_initialize_site( $site_id, array $args = array() ) {
 		)
 	);
 
+	// Clean blog cache after populating options.
+	clean_blog_cache( $site );
+
 	// Populate the site's roles.
 	populate_roles();
 	$wp_roles = new WP_Roles();

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-beta3-44726';
+$wp_version = '5.1-beta3-44727';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.