diff --git a/bin/get-server-blocks.php b/bin/get-server-blocks.php
index f573a40dfad06..6e64a5011a22e 100755
--- a/bin/get-server-blocks.php
+++ b/bin/get-server-blocks.php
@@ -19,6 +19,7 @@
 define( 'WP_USE_THEMES', false );
 require_once ABSPATH . WPINC . '/load.php';
 require_once ABSPATH . WPINC . '/default-constants.php';
+require_once ABSPATH . WPINC . '/class-wp-walker.php';
 wp_fix_server_vars();
 wp_initial_constants();
 require_once ABSPATH . WPINC . '/functions.php';
diff --git a/core-blocks/test/fixtures/core__latest-comments.json b/core-blocks/test/fixtures/core__latest-comments.json
index 155ef9f06de07..a4558772762f2 100644
--- a/core-blocks/test/fixtures/core__latest-comments.json
+++ b/core-blocks/test/fixtures/core__latest-comments.json
@@ -3,7 +3,12 @@
         "clientId": "_clientId_0",
         "name": "core/latest-comments",
         "isValid": true,
-        "attributes": {},
+        "attributes": {
+            "commentsToShow": 5,
+            "displayAvatar": true,
+            "displayDate": true,
+            "displayExcerpt": true
+        },
         "innerBlocks": [],
         "originalContent": ""
     }
diff --git a/core-blocks/test/server-registered.json b/core-blocks/test/server-registered.json
index 4adfc2b53bcd1..b75f0231026d7 100644
--- a/core-blocks/test/server-registered.json
+++ b/core-blocks/test/server-registered.json
@@ -1 +1 @@
-{"core\/block":{"attributes":{"ref":{"type":"number"}}},"core\/archives":{"attributes":{"showPostCounts":{"type":"boolean","default":false},"displayAsDropdown":{"type":"boolean","default":false},"align":{"type":"string","default":"none"}}},"core\/latest-posts":{"attributes":{"categories":{"type":"string"},"className":{"type":"string"},"postsToShow":{"type":"number","default":5},"displayPostDate":{"type":"boolean","default":false},"postLayout":{"type":"string","default":"list"},"columns":{"type":"number","default":3},"align":{"type":"string","default":"center"},"order":{"type":"string","default":"desc"},"orderBy":{"type":"string","default":"date"}}}}
\ No newline at end of file
+{"core\/block":{"attributes":{"ref":{"type":"number"}}},"core\/latest-comments":{"attributes":{"className":{"type":"string"},"commentsToShow":{"type":"number","default":5,"minimum":1,"maximum":100},"displayAvatar":{"type":"boolean","default":true},"displayDate":{"type":"boolean","default":true},"displayExcerpt":{"type":"boolean","default":true},"align":{"type":"string","enum":["center","left","right","wide","full",""]}}},"core\/archives":{"attributes":{"showPostCounts":{"type":"boolean","default":false},"displayAsDropdown":{"type":"boolean","default":false},"align":{"type":"string","default":"none"}}},"core\/latest-posts":{"attributes":{"categories":{"type":"string"},"className":{"type":"string"},"postsToShow":{"type":"number","default":5},"displayPostDate":{"type":"boolean","default":false},"postLayout":{"type":"string","default":"list"},"columns":{"type":"number","default":3},"align":{"type":"string","default":"center"},"order":{"type":"string","default":"desc"},"orderBy":{"type":"string","default":"date"}}}}
\ No newline at end of file