I sell under the Amazon Handmade category.
As of July 31 I cannot create new listings. The product listing page also changed on that day and there were new fields introduced.
One of the new fields is asking for an External Product ID which has never applied to the Handmade category, has something changed?
If I check the box "I don't have a Product ID" different things will happen depending on how many images I have uploaded.
If I have only one image uploaded I will get this error message:

It says I need to apply for a GTIN exemption which I have never encountered after many years of adding products to Amazon Handmade under the exact same category.
However, if I had two or more images, I do not get any error.
Instead, when I fill out everything I would normally fill out and go to save the product I will get a new error when I click save it shows this at the top:

It will say " -The attributes are invalid." at the top one time for every extra image that I try to upload. In this case I tried to upload a total of 3 images (1 main, 2 extra).
This error started on the same day that the "Add a Product" tool was updated which I believe was July 31st. I know that I successfully created a new product on Amazon the day before on July 30th and "add a product" tool to create a new listing was the old regular format.
I have opend a case with Amazon (case 15750418221) but they are not seeing the same errors that I am seeing.
Is anyone else under the Handmade category having this issue? Have the requirements for External Product ID changed?