diff --git a/docs/reference-guides/core-blocks.md b/docs/reference-guides/core-blocks.md
index ab6bb52b6b3b2a..bee68530eeb239 100644
--- a/docs/reference-guides/core-blocks.md
+++ b/docs/reference-guides/core-blocks.md
@@ -42,7 +42,7 @@ Create and save content to reuse across your site. Update the pattern, and the c
 -	**Name:** core/block
 -	**Category:** reusable
 -	**Supports:** ~~customClassName~~, ~~html~~, ~~inserter~~, ~~renaming~~
--	**Attributes:** overrides, ref
+-	**Attributes:** ref
 
 ## Button
 
diff --git a/packages/block-library/src/block/block.json b/packages/block-library/src/block/block.json
index d908d65d358d2b..aeccdbfc1051db 100644
--- a/packages/block-library/src/block/block.json
+++ b/packages/block-library/src/block/block.json
@@ -10,14 +10,8 @@
 	"attributes": {
 		"ref": {
 			"type": "number"
-		},
-		"overrides": {
-			"type": "object"
 		}
 	},
-	"providesContext": {
-		"pattern/overrides": "overrides"
-	},
 	"supports": {
 		"customClassName": false,
 		"html": false,
diff --git a/packages/block-library/src/block/index.php b/packages/block-library/src/block/index.php
index 9f78ffba920138..54b54fad139ff3 100644
--- a/packages/block-library/src/block/index.php
+++ b/packages/block-library/src/block/index.php
@@ -45,9 +45,32 @@ function render_block_core_block( $attributes ) {
 	global $wp_embed;
 	$content = $wp_embed->run_shortcode( $reusable_block->post_content );
 	$content = $wp_embed->autoembed( $content );
+
+	$gutenberg_experiments        = get_option( 'gutenberg-experiments' );
+	$has_partial_synced_overrides = $gutenberg_experiments
+		&& array_key_exists( 'gutenberg-pattern-partial-syncing', $gutenberg_experiments )
+		&& isset( $attributes['overrides'] );
+
+	/**
+	 * We set the `pattern/overrides` context through the `render_block_context`
+	 * filter so that it is available when a pattern's inner blocks are
+	 * rendering via do_blocks given it only receives the inner content.
+	 */
+	if ( $has_partial_synced_overrides ) {
+		$filter_block_context = static function ( $context ) use ( $attributes ) {
+			$context['pattern/overrides'] = $attributes['overrides'];
+			return $context;
+		};
+		add_filter( 'render_block_context', $filter_block_context, 1 );
+	}
+
 	$content = do_blocks( $content );
 	unset( $seen_refs[ $attributes['ref'] ] );
 
+	if ( $has_partial_synced_overrides ) {
+		remove_filter( 'render_block_context', $filter_block_context, 1 );
+	}
+
 	return $content;
 }
 
@@ -63,3 +86,28 @@ function register_block_core_block() {
 	);
 }
 add_action( 'init', 'register_block_core_block' );
+
+$gutenberg_experiments = get_option( 'gutenberg-experiments' );
+if ( $gutenberg_experiments && array_key_exists( 'gutenberg-pattern-partial-syncing', $gutenberg_experiments ) ) {
+	/**
+	 * Registers the overrides attribute for core/block.
+	 *
+	 * @param array  $args       Array of arguments for registering a block type.
+	 * @param string $block_name Block name including namespace.
+	 * @return array $args
+	 */
+	function register_block_core_block_args( $args, $block_name ) {
+		if ( 'core/block' === $block_name ) {
+			$args['attributes'] = array_merge(
+				$args['attributes'],
+				array(
+					'overrides' => array(
+						'type' => 'object',
+					),
+				)
+			);
+		}
+		return $args;
+	}
+	add_filter( 'register_block_type_args', 'register_block_core_block_args', 10, 2 );
+}