Editor: Run autoembed() before do_blocks() in block content filters

src/wp-includes/blocks.php

@@ -2648,6 +2648,9 @@ function _restore_wpautop_hook( $content ) {
  * @return string The processed content.
  */
 function _wp_apply_block_content_filters( $content, $context = '', &$seen_ids = null, $id = null ) {
+	global $wp_embed;
+	$content = $wp_embed->autoembed( $content );
+
 	$content = shortcode_unautop( $content );
 	$content = do_shortcode( $content );
 
@@ -2667,9 +2670,6 @@ function _wp_apply_block_content_filters( $content, $context = '', &$seen_ids =
 	$content = convert_smilies( $content );
 	$content = wp_filter_content_tags( $content, $context );
 
-	global $wp_embed;
-	$content = $wp_embed->autoembed( $content );
-
 	return $content;
 }
 

tests/phpunit/tests/blocks/wpApplyBlockContentFilters.php

@@ -184,6 +184,46 @@ static function () {
 		);
 	}
 
+	/**
+	 * Tests that autoembed runs before do_blocks() so that URLs which only appear
+	 * in a block's rendered output are not turned into embeds.
+	 *
+	 * @ticket 66077
+	 */
+	public function test_autoembed_runs_before_do_blocks() {
+		wp_embed_register_handler(
+			self::TEST_EMBED_HANDLER,
+			'#https?://example\.com/apply-block-content-filters#i',
+			array( $this, 'render_test_embed' )
+		);
+
+		unregister_block_type( self::TEST_BLOCK_NAME );
+		register_block_type(
+			self::TEST_BLOCK_NAME,
+			array(
+				'render_callback' => static function () {
+					return "\n\nhttps://example.com/apply-block-content-filters\n\n";
+				},
+			)
+		);
+
+		$output = _wp_apply_block_content_filters(
+			'<!-- wp:tests/apply-block-content-filters /-->',
+			'test-context'
+		);
+
+		$this->assertStringNotContainsString(
+			'<div class="apply-block-content-filters-embed">Embedded content</div>',
+			$output,
+			'WP_Embed::autoembed() should not process URLs that only appear in a block\'s rendered output.'
+		);
+		$this->assertStringContainsString(
+			'https://example.com/apply-block-content-filters',
+			$output,
+			'A URL in a block\'s rendered output should be left as-is.'
+		);
+	}
+
 	/**
 	 * Tests that seen IDs are set during block rendering and cleared afterward.
 	 *