Form errors during creation of product remove all product images

[TalkMarc]

Sylius version affected: 6.3.x

Description
During creation of a product, if there are problems with the filled out form and there have been product images added, the images will disappear upon submission. The user has to re-upload the images after fixing the reported issues with the product entry.

Steps to reproduce
On a default Sylius installation:

1. Go to product page.
2. Click "+ Create" > "Simple Product" .
3. Fill out details of a new product, but leave one essential field empty (name for example).
4. Add product images in the media section.
5. Click "Create" to submit new product form.

Possible Solution
I cannot propose a valid solution at this time.
Handling product images for products that do not exist yet will probably present a challenge.