Same computation error!!

packages/@ember/-internals/glimmer/tests/integration/components/tracked-test.js

@@ -1,10 +1,4 @@
-import {
-  Object as EmberObject,
-  A,
-  ArrayProxy,
-  ObjectProxy,
-  PromiseProxyMixin,
-} from '@ember/-internals/runtime';
+import { Object as EmberObject, A, ArrayProxy, PromiseProxyMixin } from '@ember/-internals/runtime';
 import { EMBER_CUSTOM_COMPONENT_ARG_PROXY } from '@ember/canary-features';
 import {
   computed,
@@ -716,46 +710,48 @@ if (EMBER_CUSTOM_COMPONENT_ARG_PROXY) {
         this.assertText('text:hello!');
       }
 
-      '@test works with ember-data like relationship with observable array APIs'() {
+      '@test works with records created during render'() {
         this.registerComponent('test', {
-          ComponentClass: class extends GlimmerishComponent {
-            get itemLength() {
-              return this.args.data.length;
-            }
-          },
-          template: '{{this.itemLength}}: {{#each this.args.data as |item|}}{{item.name}}{{/each}}',
+          ComponentClass: class extends GlimmerishComponent {},
+          template: '{{@data.length}}',
         });
 
-        function createArrayProxy() {
-          let array = ArrayProxy.create({
-            content: A([
-              ObjectProxy.create({ name: 'a' }),
-              ObjectProxy.create({ name: 'b' }),
-              ObjectProxy.create({ name: 'b' }),
-            ]),
-          });
+        let RecordMeta = new WeakMap();
+        function getRecordMeta(record) {
+          let meta = RecordMeta.get(record);
+          if (meta === undefined) {
+            meta = Object.create(null);
+            RecordMeta.set(record, meta);
+          }
 
-          return array;
+          return meta;
         }
 
-        class Person {
-          get items() {
-            if (this._items) {
-              return this._items;
-            }
-            let array = createArrayProxy();
-            return (this._items = array.filterBy('name', 'b'));
+        // does not reproduce with native JS class only
+        class Person extends EmberObject {
+          get name() {
+            let meta = getRecordMeta(this);
+            let name = get(meta, 'name');
+            return name;
           }
-          set items(v) {
-            set(this, '_items', this._items.filterBy('naem', 'b'));
+          set name(v) {
+            let meta = getRecordMeta(this);
+            set(meta, 'name', v);
           }
         }
 
-        this.render('<Test @data={{this.data.items}} />', {
-          data: new Person(),
+        class List {
+          get records() {
+            let p = Person.create({ name: 'ye-haw' });
+            return [p];
+          }
+        }
+
+        this.render('<Test @data={{this.data.records}} />', {
+          data: new List(),
         });
 
-        this.assertText('2: bb');
+        this.assertText('1');
       }
     }
   );