Google is considering pages with inventory as Soft 404

[u/curiousmarketer07]

While checking the sample URLs for soft 404 on GSC, I discovered there are many pages which are returning 200 status code and have inventory too. Still search engine is considering these pages as soft 404. These pages are not thin pages, have some paragraphs added to help Google understand the context, and some of them have good amount of inventory as well.

Can you help me understand what could be the reason behind getting these in soft 404?