How to return full links to a product in Bitrix?

Question

1C-Bitrix

Guys, tell me, I understand that I’m missing a trifle somewhere, but .. I can’t find the reason ((
I decided to turn on the CNC in Bitrix, they recommend everywhere for better acceptance by Yandex and Google, etc. ...
as a result, all goods from the view

site.ru/catalog/podkatalog/product1

turned into

site.ru/product/product1

Perhaps this is correct, but ... it had a bad effect on the site in terms of positions and a month later the positions fell, many pages fell out of the search, etc..

Hence the question - how to return everything back ??
when the CNC is turned off, the sections open, but when you click on a product, "product not found" opens. although I can see all the products through the admin panel. Reloading from 1C does not help .. clearing the cache too ((

Answer 1

when changing links, it was necessary to additionally do redirects from old to new