Why does Yandex assign the status Duplicate page?

Question

Search Engine Optimization

There is a Product Subcategory page A (spotlights) and a product page B (Lights VOD) created by an SEO filter , where the product is filtered by label.
Yandex considers both pages to be duplicates . Product Subcategories C.
Of course, the pages are completely different, with different products, texts and meta descriptions.
According to the history of rounds - 3 issues everything was fine, in the last one the status Double appeared.
I would like to know why this happens and how to avoid it?

Answer 1

Think that they
didn’t prescribe Canonical?
Well, the dumbest thing is to always give links to pages

Answer 2

Write to Platons, I came across this. They will probably answer that at some point the crawler was given duplicate content.