Is there a way to have 2 sites with different languages, the same products and different descriptions for corresponding languages of the 2 websites?

I have issues translating product website description in Odoo 14.0-20201112 (Community Edition).

I have 2 websites. Each uses different, but only 1 language:

a.com - English (default)

b.si - Slovenian (default)

Then I created a product and went to the website a.com to create a description for the website for that product. I wrote it in English since page only uses English. When finished I went to website b.si - as expected there was already default description in English prepopulated from the already made description for the product on website a.com.

Unexpected behaviour is when I edit that description on page b.si. Instead of creating Slovenian translation, it modifies the original description already made in English. And changes made then also show back on website a.com.

I tried to export product and modify the translation in that way, but was not successful. The only way I was able to kind of make it works is when I installed both languages on the same website (I chose a.com and installed  English + Slovenian and made English default) and then went through a new translation interface. Descriptions translated in that way were successfully showing for correct languages (also Slovenian on website b.si), but that is undesirable final set up because of the danger of duplicate content for SEO.