diff --git a/src/wp-includes/blocks.php b/src/wp-includes/blocks.php
index a8ed76d3bd71f..dff2ada10b6eb 100644
--- a/src/wp-includes/blocks.php
+++ b/src/wp-includes/blocks.php
@@ -1844,6 +1844,7 @@ function traverse_and_serialize_block( $block, $pre_callback = null, $post_callb
  * Replaces patterns in a block tree with their content.
  *
  * @since 6.6.0
+ * @since 7.0.0 Adds metadata to attributes of single-pattern container blocks.
  *
  * @param array $blocks An array blocks.
  *
@@ -1880,7 +1881,39 @@ function resolve_pattern_blocks( $blocks ) {
 				continue;
 			}
 
-			$blocks_to_insert   = parse_blocks( $pattern['content'] );
+			$blocks_to_insert = parse_blocks( trim( $pattern['content'] ) );
+
+			/*
+			 * For single-root patterns, add the pattern name to make this a pattern instance in the editor.
+			 * If the pattern has metadata, merge it with the existing metadata.
+			 */
+			if ( count( $blocks_to_insert ) === 1 ) {
+				$block_metadata                = $blocks_to_insert[0]['attrs']['metadata'] ?? array();
+				$block_metadata['patternName'] = $slug;
+
+				/*
+				 * Merge pattern metadata with existing block metadata.
+				 * Pattern metadata takes precedence, but existing block metadata
+				 * is preserved as a fallback when the pattern doesn't define that field.
+				 * Only the defined fields (name, description, categories) are updated;
+				 * other metadata keys are preserved.
+				 */
+				foreach ( array(
+					'name'        => 'title', // 'title' is the field in the pattern object 'name' is the field in the block metadata.
+					'description' => 'description',
+					'categories'  => 'categories',
+				) as $key => $pattern_key ) {
+					$value = $pattern[ $pattern_key ] ?? $block_metadata[ $key ] ?? null;
+					if ( $value ) {
+						$block_metadata[ $key ] = is_array( $value )
+							? array_map( 'sanitize_text_field', $value )
+							: sanitize_text_field( $value );
+					}
+				}
+
+				$blocks_to_insert[0]['attrs']['metadata'] = $block_metadata;
+			}
+
 			$seen_refs[ $slug ] = true;
 			$prev_inner_content = $inner_content;
 			$inner_content      = null;
diff --git a/tests/phpunit/tests/blocks/resolvePatternBlocks.php b/tests/phpunit/tests/blocks/resolvePatternBlocks.php
index b2e6fa6463f7d..4b28db4613f00 100644
--- a/tests/phpunit/tests/blocks/resolvePatternBlocks.php
+++ b/tests/phpunit/tests/blocks/resolvePatternBlocks.php
@@ -30,12 +30,74 @@ public function set_up() {
 				'description' => 'Recursive pattern.',
 			)
 		);
+		register_block_pattern(
+			'core/single-root',
+			array(
+				'title'       => 'Single Root Pattern',
+				'content'     => '<!-- wp:paragraph -->Single root content<!-- /wp:paragraph -->',
+				'description' => 'A single root pattern.',
+				'categories'  => array( 'text' ),
+			)
+		);
+		register_block_pattern(
+			'core/single-root-with-forbidden-chars-in-attrs',
+			array(
+				'title'       => 'Single Root Pattern<script>alert("XSS")</script>',
+				'content'     => '<!-- wp:paragraph -->Single root content<!-- /wp:paragraph -->',
+				'description' => 'A single root pattern.<script>alert("XSS")</script><img src=x onerror=alert(1)>',
+				'categories'  => array(
+					'text<script>alert("XSS")</script>',
+					'bad\'); DROP TABLE wp_posts;--',
+					'<img src=x onerror=alert(1)>',
+					"evil\x00null\nbyte",
+					'category with <strong>html</strong> tags',
+				),
+			)
+		);
+		register_block_pattern(
+			'core/with-attrs',
+			array(
+				'title'       => 'Pattern With Attrs',
+				'content'     => '<!-- wp:paragraph {"className":"custom-class"} -->Content<!-- /wp:paragraph -->',
+				'description' => 'A pattern with existing attributes.',
+			)
+		);
+		register_block_pattern(
+			'core/nested-single',
+			array(
+				'title'       => 'Nested Pattern',
+				'content'     => '<!-- wp:group --><!-- wp:paragraph -->Nested content<!-- /wp:paragraph --><!-- wp:pattern {"slug":"core/single-root"} /--><!-- /wp:group -->',
+				'description' => 'A nested single root pattern.',
+				'categories'  => array( 'featured' ),
+			)
+		);
+		register_block_pattern(
+			'core/existing-metadata',
+			array(
+				'title'   => 'Existing Metadata Pattern',
+				'content' => '<!-- wp:paragraph {"metadata":{"patternName":"core/existing-metadata-should-not-overwrite","description":"A existing metadata pattern.","categories":["cake"]}} -->Existing metadata content<!-- /wp:paragraph -->',
+			)
+		);
+		register_block_pattern(
+			'core/with-custom-metadata',
+			array(
+				'title'       => 'Pattern With Custom Metadata',
+				'content'     => '<!-- wp:paragraph {"metadata":{"customKey":"customValue","anotherKey":123,"booleanKey":true}} -->Content with custom metadata<!-- /wp:paragraph -->',
+				'description' => 'A pattern with custom metadata keys.',
+				'categories'  => array( 'test' ),
+			)
+		);
 	}
 
 	public function tear_down() {
 		unregister_block_pattern( 'core/test' );
 		unregister_block_pattern( 'core/recursive' );
-
+		unregister_block_pattern( 'core/single-root' );
+		unregister_block_pattern( 'core/single-root-with-forbidden-chars-in-attrs' );
+		unregister_block_pattern( 'core/with-attrs' );
+		unregister_block_pattern( 'core/nested-single' );
+		unregister_block_pattern( 'core/existing-metadata' );
+		unregister_block_pattern( 'core/with-custom-metadata' );
 		parent::tear_down();
 	}
 
@@ -60,13 +122,55 @@ public function test_should_resolve_pattern_blocks_as_expected( $blocks, $expect
 	public function data_should_resolve_pattern_blocks_as_expected() {
 		return array(
 			// Works without attributes, leaves the block as is.
-			'pattern with no slug attribute' => array( '<!-- wp:pattern /-->', '<!-- wp:pattern /-->' ),
+			'pattern with no slug attribute' => array(
+				'<!-- wp:pattern /-->',
+				'<!-- wp:pattern /-->',
+			),
 			// Resolves the pattern.
-			'test pattern'                   => array( '<!-- wp:pattern {"slug":"core/test"} /-->', '<!-- wp:paragraph -->Hello<!-- /wp:paragraph --><!-- wp:paragraph -->World<!-- /wp:paragraph -->' ),
+			'test pattern'                   => array(
+				'<!-- wp:pattern {"slug":"core/test"} /-->',
+				'<!-- wp:paragraph -->Hello<!-- /wp:paragraph --><!-- wp:paragraph -->World<!-- /wp:paragraph -->',
+			),
 			// Skips recursive patterns.
-			'recursive pattern'              => array( '<!-- wp:pattern {"slug":"core/recursive"} /-->', '<!-- wp:paragraph -->Recursive<!-- /wp:paragraph -->' ),
+			'recursive pattern'              => array(
+				'<!-- wp:pattern {"slug":"core/recursive"} /-->',
+				'<!-- wp:paragraph -->Recursive<!-- /wp:paragraph -->',
+			),
 			// Resolves the pattern within a block.
-			'pattern within a block'         => array( '<!-- wp:group --><!-- wp:paragraph -->Before<!-- /wp:paragraph --><!-- wp:pattern {"slug":"core/test"} /--><!-- wp:paragraph -->After<!-- /wp:paragraph --><!-- /wp:group -->', '<!-- wp:group --><!-- wp:paragraph -->Before<!-- /wp:paragraph --><!-- wp:paragraph -->Hello<!-- /wp:paragraph --><!-- wp:paragraph -->World<!-- /wp:paragraph --><!-- wp:paragraph -->After<!-- /wp:paragraph --><!-- /wp:group -->' ),
+			'pattern within a block'         => array(
+				'<!-- wp:group --><!-- wp:paragraph -->Before<!-- /wp:paragraph --><!-- wp:pattern {"slug":"core/test"} /--><!-- wp:paragraph -->After<!-- /wp:paragraph --><!-- /wp:group -->',
+				'<!-- wp:group --><!-- wp:paragraph -->Before<!-- /wp:paragraph --><!-- wp:paragraph -->Hello<!-- /wp:paragraph --><!-- wp:paragraph -->World<!-- /wp:paragraph --><!-- wp:paragraph -->After<!-- /wp:paragraph --><!-- /wp:group -->',
+			),
+			// Resolves the single-root pattern and adds metadata.
+			'single-root pattern'            => array(
+				'<!-- wp:pattern {"slug":"core/single-root"} /-->',
+				'<!-- wp:paragraph {"metadata":{"patternName":"core/single-root","name":"Single Root Pattern","description":"A single root pattern.","categories":["text"]}} -->Single root content<!-- /wp:paragraph -->',
+			),
+			// Existing attributes are preserved when adding metadata.
+			'existing attributes preserved'  => array(
+				'<!-- wp:pattern {"slug":"core/with-attrs"} /-->',
+				'<!-- wp:paragraph {"className":"custom-class","metadata":{"patternName":"core/with-attrs","name":"Pattern With Attrs","description":"A pattern with existing attributes."}} -->Content<!-- /wp:paragraph -->',
+			),
+			// Resolves the nested single-root pattern and adds metadata.
+			'nested single-root pattern'     => array(
+				'<!-- wp:pattern {"slug":"core/nested-single"} /-->',
+				'<!-- wp:group {"metadata":{"patternName":"core/nested-single","name":"Nested Pattern","description":"A nested single root pattern.","categories":["featured"]}} --><!-- wp:paragraph -->Nested content<!-- /wp:paragraph --><!-- wp:paragraph {"metadata":{"patternName":"core/single-root","name":"Single Root Pattern","description":"A single root pattern.","categories":["text"]}} -->Single root content<!-- /wp:paragraph --><!-- /wp:group -->',
+			),
+			// Sanitizes fields.
+			'sanitized pattern attrs'        => array(
+				'<!-- wp:pattern {"slug":"core/single-root-with-forbidden-chars-in-attrs"} /-->',
+				'<!-- wp:paragraph {"metadata":{"patternName":"core/single-root-with-forbidden-chars-in-attrs","name":"Single Root Pattern","description":"A single root pattern.","categories":["text","bad\'); DROP TABLE wp_posts;\u002d\u002d","","evil\u0000null byte","category with html tags"]}} -->Single root content<!-- /wp:paragraph -->',
+			),
+			// Metadata is merged with existing metadata and existing metadata is preserved.
+			'existing metadata preserved'    => array(
+				'<!-- wp:pattern {"slug":"core/existing-metadata"} /-->',
+				'<!-- wp:paragraph {"metadata":{"patternName":"core/existing-metadata","description":"A existing metadata pattern.","categories":["cake"],"name":"Existing Metadata Pattern"}} -->Existing metadata content<!-- /wp:paragraph -->',
+			),
+			// Custom metadata keys are preserved when resolving patterns.
+			'custom metadata preserved'      => array(
+				'<!-- wp:pattern {"slug":"core/with-custom-metadata"} /-->',
+				'<!-- wp:paragraph {"metadata":{"customKey":"customValue","anotherKey":123,"booleanKey":true,"patternName":"core/with-custom-metadata","name":"Pattern With Custom Metadata","description":"A pattern with custom metadata keys.","categories":["test"]}} -->Content with custom metadata<!-- /wp:paragraph -->',
+			),
 		);
 	}
 }