diff --git a/packages/js/manifests/polywrap/src/formats/polywrap.build/migrators/0.1.0_to_0.2.0.ts b/packages/js/manifests/polywrap/src/formats/polywrap.build/migrators/0.1.0_to_0.2.0.ts
index f076051a3d..070eb39853 100644
--- a/packages/js/manifests/polywrap/src/formats/polywrap.build/migrators/0.1.0_to_0.2.0.ts
+++ b/packages/js/manifests/polywrap/src/formats/polywrap.build/migrators/0.1.0_to_0.2.0.ts
@@ -5,7 +5,8 @@ import { BuildManifest as NewManifest } from "../0.2.0";
 
 export function migrate(old: OldManifest): NewManifest {
   return {
-    ...old,
+    config: old.config,
+    linked_packages: old.linked_packages,
     __type: "BuildManifest",
     format: "0.2.0",
     strategies: {
diff --git a/packages/js/manifests/polywrap/src/formats/polywrap/migrators/0.2.0_to_0.3.0.ts b/packages/js/manifests/polywrap/src/formats/polywrap/migrators/0.2.0_to_0.3.0.ts
index 5c9398f8b5..f3f862628e 100644
--- a/packages/js/manifests/polywrap/src/formats/polywrap/migrators/0.2.0_to_0.3.0.ts
+++ b/packages/js/manifests/polywrap/src/formats/polywrap/migrators/0.2.0_to_0.3.0.ts
@@ -1,7 +1,8 @@
-import { ILogger } from "@polywrap/logging-js";
 import { PolywrapManifest as OldManifest } from "../0.2.0";
 import { PolywrapManifest as NewManifest } from "../0.3.0";
 
+import { ILogger } from "@polywrap/logging-js";
+
 export function migrate(migrate: OldManifest, logger?: ILogger): NewManifest {
   if (migrate.extensions?.meta) {
     logger?.warn(
@@ -21,8 +22,11 @@ export function migrate(migrate: OldManifest, logger?: ILogger): NewManifest {
     );
     delete migrate.extensions.infra;
   }
+  const hasExtensions =
+    migrate.extensions && Object.keys(migrate.extensions).length > 0;
   return {
     ...migrate,
     format: "0.3.0",
+    extensions: hasExtensions ? migrate.extensions : undefined,
   };
 }