diff --git a/wp-includes/class-wp-theme-json-schema.php b/wp-includes/class-wp-theme-json-schema.php
index 6374a911bb..78c13d60b8 100644
--- a/wp-includes/class-wp-theme-json-schema.php
+++ b/wp-includes/class-wp-theme-json-schema.php
@@ -14,6 +14,7 @@
  * This is a low-level API that may need to do breaking changes. Please,
  * use get_global_settings, get_global_styles, and get_global_stylesheet instead.
  *
+ * @since 5.9.0
  * @access private
  */
 class WP_Theme_JSON_Schema {
@@ -32,6 +33,8 @@ class WP_Theme_JSON_Schema {
 	/**
 	 * Function that migrates a given theme.json structure to the last version.
 	 *
+	 * @since 5.9.0
+	 *
 	 * @param array $theme_json The structure to migrate.
 	 *
 	 * @return array The structure in the last version.
@@ -59,6 +62,8 @@ class WP_Theme_JSON_Schema {
 	 * 'spacing.customPadding'       => 'spacing.padding',
 	 * 'typography.customLineHeight' => 'typography.lineHeight',
 	 *
+	 * @since 5.9.0
+	 *
 	 * @param array $old Data to migrate.
 	 *
 	 * @return array Data without the custom prefixes.
@@ -81,6 +86,8 @@ class WP_Theme_JSON_Schema {
 	/**
 	 * Processes the settings subtree.
 	 *
+	 * @since 5.9.0
+	 *
 	 * @param array $settings        Array to process.
 	 * @param array $paths_to_rename Paths to rename.
 	 *
@@ -105,6 +112,8 @@ class WP_Theme_JSON_Schema {
 	/**
 	 * Processes a settings array, renaming or moving properties.
 	 *
+	 * @since 5.9.0
+	 *
 	 * @param array $settings        Reference to settings either defaults or an individual block's.
 	 * @param arary $paths_to_rename Paths to rename.
 	 */
@@ -124,6 +133,8 @@ class WP_Theme_JSON_Schema {
 	/**
 	 * Removes a property from within the provided settings by its path.
 	 *
+	 * @since 5.9.0
+	 *
 	 * @param array $settings Reference to the current settings array.
 	 * @param array $path Path to the property to be removed.
 	 *
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 28506fec0e..b2c86b2496 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-beta1-52305';
+$wp_version = '5.9-beta1-52306';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.