diff --git a/addons/web/static/src/views/form/form_controller.js b/addons/web/static/src/views/form/form_controller.js
index e0dd5f65142..870134b5da0 100644
--- a/addons/web/static/src/views/form/form_controller.js
+++ b/addons/web/static/src/views/form/form_controller.js
@@ -371,7 +371,9 @@ export class FormController extends Component {
     computeTranslateAlert() {
         if (this.shouldShowTranslateAlert) {
             this.translateAlertData[this.model.root.resId] = new Set([
-                ...(this.translateAlertData[this.model.root.resId] || []),
+                ...(this.translateAlertData[this.model.root.resId]
+                    ? toRaw(this.translateAlertData[this.model.root.resId])
+                    : []),
                 ...this.model.root.dirtyTranslatableFields,
             ]);
         }
diff --git a/addons/web/static/tests/views/form/form_view_tests.js b/addons/web/static/tests/views/form/form_view_tests.js
index 568c8bb71c2..69e857c31a9 100644
--- a/addons/web/static/tests/views/form/form_view_tests.js
+++ b/addons/web/static/tests/views/form/form_view_tests.js
@@ -7833,7 +7833,8 @@ QUnit.module("Views", (hooks) => {
         );
 
         await clickEdit(target);
-        await editInput(target, '[name="display_name"] input', "test2");
+        await editInput(target, '[name="foo"] input', "test2");
+        await editInput(target, '[name="display_name"] input', "test3");
         await clickSave(target);
         assert.containsN(
             target,