Ticket #46187: 46187-1.diff

src/wp-includes/blocks.php

@@ -200 +200 @@
          */
         $block = apply_filters( 'render_block_data', $block, $source_block );
 
-        $block_type    = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] );
-        $is_dynamic    = $block['blockName'] && null !== $block_type && $block_type->is_dynamic();
+        $block_name = $block['blockName'];
+
+        $block_type    = WP_Block_Type_Registry::get_instance()->get_registered( $block_name );
+        $is_dynamic    = $block_name && null !== $block_type && $block_type->is_dynamic();
         $block_content = '';
         $index         = 0;
 
@@ -227 +229 @@
          * @param string $block_content The block content about to be appended.
          * @param array  $block         The full block, including name and attributes.
          */
-        return apply_filters( 'render_block', $block_content, $block );
+        $block_content = apply_filters( 'render_block', $block_content, $block );
+
+        /**
+         * Filters the content of a single block.
+         * 
+         * The dynamic portion of the hook name, `$block_name`, refers to
+         * the block name - "namespace/block".
+         *
+         * @since x.y.z
+         *
+         * @param string $block_content The block content about to be appended.
+         * @param array  $block         The full block, including name and attributes.
+         */
+        return apply_filters( "render_block_{$block_name}", $block_content, $block );
 }
 
 /**