fix: only call registerDefaults when registry isn't init'ed

src/sdk.ts

@@ -33,9 +33,8 @@ export class Sdk {
   public protocols(): Registry {
     if (!this.registry) {
       this.registry = new Registry(this);
-    }
-
       registerDefaults(this.registry!);
+    }
 
     return this.registry!;
   }