Block fields correctly

example/src/App.vue

@@ -55,7 +55,8 @@ export default {
   name: "App",
   methods: {
     blockField(x, y, key) {
-      // We won't move fields with ID 'obj8' and nothing into (4, 3)
+      // We won't move fields with ID 'obj8' and nothing into (3, 3) and (4, 3)
+      if (x === 3 && y === 3) return false;
       if (x === 4 && y === 3) return false;
       return key !== "obj8";
     },