diff --git a/core/insertion_marker_manager.ts b/core/insertion_marker_manager.ts
index 35e46dc01..effe78219 100644
--- a/core/insertion_marker_manager.ts
+++ b/core/insertion_marker_manager.ts
@@ -225,7 +225,12 @@ export class InsertionMarkerManager {
     eventUtils.disable();
     let result: BlockSvg;
     try {
-      const blockJson = blocks.save(sourceBlock);
+      const blockJson = blocks.save(sourceBlock, {
+        addCoordinates: false,
+        addInputBlocks: false,
+        addNextBlocks: false,
+        doFullSerialization: false,
+      });
       if (!blockJson) {
         throw new Error('Failed to serialize source block.');
       }
diff --git a/package-lock.json b/package-lock.json
index c80164dac..524681ded 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "blockly",
-  "version": "10.1.1",
+  "version": "10.1.2",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "blockly",
-      "version": "10.1.1",
+      "version": "10.1.2",
       "hasInstallScript": true,
       "license": "Apache-2.0",
       "dependencies": {
diff --git a/package.json b/package.json
index d7649dfdf..748bffd3c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "blockly",
-  "version": "10.1.1",
+  "version": "10.1.2",
   "description": "Blockly is a library for building visual programming editors.",
   "keywords": [
     "blockly"