If you need to keep working with custom fields while the HTML5 validation issue is being fixed, you can temporarily disable validation by running this JavaScript snippet in your browser console before saving your changes:
document.querySelectorAll('form').forEach(form => {
form.noValidate = true;
form.querySelectorAll('[required]').forEach(el => el.removeAttribute('required'));
});
This will allow form submissions without HTML5 validation blocking the save action.
