We noticed that under the following circumstances, the form closes and returns to the list without saving the item.
Steps to reproduce:
- Create a new custom list
- Add a number field that is required
- Add Rich Forms for New item creation
- Ensure the Attachments field is in the form
- Save the Rich Form and create a new item
- Fill in the title and the number fields and add an attachment
- Save the item
- The form closes and redirects to the List, but no item has been created
Here's a short video that demonstrates the behavior:
If no attachment is added, then validation works as expected and the form shows the server side validation errors.