diff --git a/addons/web/static/src/js/views/form/form_renderer.js b/addons/web/static/src/js/views/form/form_renderer.js
index 66d4c5d8bd2..2b91c5820ee 100644
--- a/addons/web/static/src/js/views/form/form_renderer.js
+++ b/addons/web/static/src/js/views/form/form_renderer.js
@@ -5,7 +5,6 @@ var BasicRenderer = require('web.BasicRenderer');
 var config = require('web.config');
 var core = require('web.core');
 var dom = require('web.dom');
-const { WidgetAdapterMixin } = require('web.OwlCompatibility');
 var viewUtils = require('web.viewUtils');
 
 var _t = core._t;
@@ -14,7 +13,7 @@ var qweb = core.qweb;
 // symbol used as key to set the <field> node id on its widget
 const symbol = Symbol('form');
 
-var FormRenderer = BasicRenderer.extend(WidgetAdapterMixin, {
+var FormRenderer = BasicRenderer.extend({
     className: "o_form_view",
     events: _.extend({}, BasicRenderer.prototype.events, {
         'click .o_notification_box .oe_field_translate': '_onTranslate',
@@ -53,18 +52,10 @@ var FormRenderer = BasicRenderer.extend(WidgetAdapterMixin, {
         this._applyFormSizeClass();
         return this._super.apply(this, arguments);
     },
-    /**
-     * @override
-     */
-    destroy() {
-        this._super(...arguments);
-        WidgetAdapterMixin.destroy.call(this);
-    },
     /**
      * Called each time the form view is attached into the DOM
      */
     on_attach_callback: function () {
-        WidgetAdapterMixin.on_attach_callback.call(this);
         this._isInDom = true;
         _.invoke(this.widgets, 'on_attach_callback');
         this._super.apply(this, arguments);
@@ -73,7 +64,6 @@ var FormRenderer = BasicRenderer.extend(WidgetAdapterMixin, {
      * Called each time the renderer is detached from the DOM.
      */
     on_detach_callback: function () {
-        WidgetAdapterMixin.on_detach_callback.call(this);
         this._isInDom = false;
         this._super.apply(this, arguments);
     },
diff --git a/addons/web/static/tests/views/form_tests.js b/addons/web/static/tests/views/form_tests.js
index 5033c990c43..edc96a05e71 100644
--- a/addons/web/static/tests/views/form_tests.js
+++ b/addons/web/static/tests/views/form_tests.js
@@ -6,6 +6,7 @@ var BasicModel = require('web.BasicModel');
 var concurrency = require('web.concurrency');
 var core = require('web.core');
 var fieldRegistry = require('web.field_registry');
+const fieldRegistryOwl = require('web.field_registry_owl');
 var FormView = require('web.FormView');
 var mixins = require('web.mixins');
 var NotificationService = require('web.NotificationService');
@@ -9532,6 +9533,34 @@ QUnit.module('Views', {
         form.destroy();
         delete widgetRegistry.map.test;
     });
+
+    QUnit.test('do not call mounted twice on children', async function (assert) {
+        assert.expect(3);
+
+        class CustomFieldComponent extends fieldRegistryOwl.get('boolean') {
+            mounted() {
+                super.mounted(...arguments);
+                assert.step('mounted');
+            }
+            willUnmount() {
+                super.willUnmount(...arguments);
+                assert.step('willUnmount');
+            }
+        }
+        fieldRegistryOwl.add('custom', CustomFieldComponent);
+
+        const form = await createView({
+            View: FormView,
+            model: 'partner',
+            data: this.data,
+            arch: `<form><field name="bar" widget="custom"/></form>`,
+        });
+
+        form.destroy();
+        delete fieldRegistryOwl.map.custom;
+        
+        assert.verifySteps(['mounted', 'willUnmount']);
+    });
 });
 
 });