In recent develop, example demos/form/form2.php don't work:

• First form can never be saved, as iso cannot be empty, nor cannot it be changed
• If you deactivate all validation handling in onSubmit to make it work again, still it will throw an error Javascript Error Syntax error, unrecognized expression: #

The second form throws error Atk4\Ui\Exception: Callback requested, but never reached. You may be missing some arguments in request URL. on save.