Default Product with variants is not carried across to new products

-- HikaShop version -- : 4.1.0
-- HikaMarket version -- : 3.0.2
-- Joomla version -- : 3.9.10
-- PHP version -- : 7.2.20
-- Browser(s) name and version -- : Chrome 75.0.3770.100

I have two variants setup in my default product template. epub and mobi which will present a different file to the user.
When the vendor goes to add a new product it does not carry the two variants I've setup across to the vendor's product application. In the default I've set up it shows 2 variants, in the vendor's new product it shows them as '0' although the settings indicate the variant is set.

How can I ensure that the variants are carried across in the default product template?

OK, thanks I followed your conversation on that thread and recognise the issue as there being no product to hook the variants to until it is created, then saved by the user. So, I thought it might work if I actually placed a temporary file in the product template's variants as a placeholder and this didn't work either, but might be a potential workaround that you could generate with some programming.