diff --git a/src/wp-includes/blocks.php b/src/wp-includes/blocks.php
index 9e3e470304fb8..e7e71fac44444 100644
--- a/src/wp-includes/blocks.php
+++ b/src/wp-includes/blocks.php
@@ -2090,29 +2090,7 @@ function render_block( $parsed_block ) {
 		$context['postType'] = $post->post_type;
 	}
 
-	/**
-	 * Filters the default context provided to a rendered block.
-	 *
-	 * @since 5.5.0
-	 * @since 5.9.0 The `$parent_block` parameter was added.
-	 *
-	 * @param array         $context      Default context.
-	 * @param array         $parsed_block {
-	 *     An associative array of the block being rendered. See WP_Block_Parser_Block.
-	 *
-	 *     @type string   $blockName    Name of block.
-	 *     @type array    $attrs        Attributes from block comment delimiters.
-	 *     @type array[]  $innerBlocks  List of inner blocks. An array of arrays that
-	 *                                  have the same structure as this one.
-	 *     @type string   $innerHTML    HTML from inside block comment delimiters.
-	 *     @type array    $innerContent List of string fragments and null markers where
-	 *                                  inner blocks were found.
-	 * }
-	 * @param WP_Block|null $parent_block If this is a nested block, a reference to the parent block.
-	 */
-	$context = apply_filters( 'render_block_context', $context, $parsed_block, $parent_block );
-
-	$block = new WP_Block( $parsed_block, $context );
+	$block = new WP_Block( $parsed_block, $context, null, $parent_block );
 
 	return $block->render();
 }
diff --git a/src/wp-includes/class-wp-block-list.php b/src/wp-includes/class-wp-block-list.php
index e1151e6745dfc..0e341e0449f38 100644
--- a/src/wp-includes/class-wp-block-list.php
+++ b/src/wp-includes/class-wp-block-list.php
@@ -41,18 +41,29 @@ class WP_Block_List implements Iterator, ArrayAccess, Countable {
 	 */
 	protected $registry;
 
+	/**
+	 * Reference to the parent block.
+	 *
+	 * @since 6.7.0
+	 * @var WP_Block|null
+	 * @access protected
+	 */
+	protected $parent_block;
+
 	/**
 	 * Constructor.
 	 *
 	 * Populates object properties from the provided block instance argument.
 	 *
 	 * @since 5.5.0
+	 * @since 6.7.0 Added the optional `$parent_block` argument.
 	 *
 	 * @param array[]|WP_Block[]     $blocks            Array of parsed block data, or block instances.
 	 * @param array                  $available_context Optional array of ancestry context values.
 	 * @param WP_Block_Type_Registry $registry          Optional block type registry.
+	 * @param WP_Block|null          $parent_block      Optional. If this is a nested block, a reference to the parent block.
 	 */
-	public function __construct( $blocks, $available_context = array(), $registry = null ) {
+	public function __construct( $blocks, $available_context = array(), $registry = null, $parent_block = null ) {
 		if ( ! $registry instanceof WP_Block_Type_Registry ) {
 			$registry = WP_Block_Type_Registry::get_instance();
 		}
@@ -60,6 +71,7 @@ public function __construct( $blocks, $available_context = array(), $registry =
 		$this->blocks            = $blocks;
 		$this->available_context = $available_context;
 		$this->registry          = $registry;
+		$this->parent_block      = $parent_block;
 	}
 
 	/**
@@ -93,7 +105,7 @@ public function offsetGet( $offset ) {
 		$block = $this->blocks[ $offset ];
 
 		if ( isset( $block ) && is_array( $block ) ) {
-			$block = new WP_Block( $block, $this->available_context, $this->registry );
+			$block = new WP_Block( $block, $this->available_context, $this->registry, $this->parent_block );
 
 			$this->blocks[ $offset ] = $block;
 		}
diff --git a/src/wp-includes/class-wp-block.php b/src/wp-includes/class-wp-block.php
index f7fd53dfc9710..e70981cf2ada5 100644
--- a/src/wp-includes/class-wp-block.php
+++ b/src/wp-includes/class-wp-block.php
@@ -112,6 +112,7 @@ class WP_Block {
 	 * its registered type will be assigned to the block's `context` property.
 	 *
 	 * @since 5.5.0
+	 * @since 6.7.0 Added the optional `$parent_block` argument.
 	 *
 	 * @param array                  $block             {
 	 *     An associative array of a single parsed block object. See WP_Block_Parser_Block.
@@ -126,7 +127,7 @@ class WP_Block {
 	 * @param array                  $available_context Optional array of ancestry context values.
 	 * @param WP_Block_Type_Registry $registry          Optional block type registry.
 	 */
-	public function __construct( $block, $available_context = array(), $registry = null ) {
+	public function __construct( $block, $available_context = array(), $registry = null, $parent_block = null ) {
 		$this->parsed_block = $block;
 		$this->name         = $block['blockName'];
 
@@ -138,7 +139,7 @@ public function __construct( $block, $available_context = array(), $registry = n
 
 		$this->block_type = $registry->get_registered( $this->name );
 
-		$this->available_context = $available_context;
+		$this->available_context = apply_filters( 'render_block_context', $available_context, $block, $parent_block );
 
 		if ( ! empty( $this->block_type->uses_context ) ) {
 			foreach ( $this->block_type->uses_context as $context_name ) {
@@ -159,7 +160,7 @@ public function __construct( $block, $available_context = array(), $registry = n
 				}
 			}
 
-			$this->inner_blocks = new WP_Block_List( $block['innerBlocks'], $child_context, $registry );
+			$this->inner_blocks = new WP_Block_List( $block['innerBlocks'], $child_context, $registry, $parent_block );
 		}
 
 		if ( ! empty( $block['innerHTML'] ) ) {