diff --git a/addons/web_editor/static/src/js/backend/field_html.js b/addons/web_editor/static/src/js/backend/field_html.js
index 2ed796da3da..97cfc6b3e25 100644
--- a/addons/web_editor/static/src/js/backend/field_html.js
+++ b/addons/web_editor/static/src/js/backend/field_html.js
@@ -101,12 +101,20 @@ var FieldHtml = basic_fields.DebouncedField.extend(TranslatableFieldMixin, {
             return this._super();
         }
         var _super = this._super.bind(this);
-        await this.wysiwyg.cleanForSave();
+        // Do not wait for the resolution of the cleanForSave promise to update
+        // the internal value in case this happens during an urgentSave as the
+        // beforeunload event does not play well with asynchronicity. It is
+        // better to have a partially cleared value than to lose changes. When
+        // this function is called outside of an urgentSave context, the full
+        // cleaning is still awaited below and `_super` will reupdate the value.
+        const fullClean = this.wysiwyg.cleanForSave();
         this._setValue(this._getValue());
-        return this.wysiwyg.saveModifiedImages(this.$content).then(() => {
-            this._isDirty = this.wysiwyg.isDirty();
-            _super();
-        });
+        this._isDirty = this.wysiwyg.isDirty();
+        await fullClean;
+        await this.wysiwyg.saveModifiedImages(this.$content);
+        // Update the value to the fully cleaned version.
+        this._setValue(this._getValue());
+        _super();
     },
     /**
      * @override