Updating the unloading of 1c-bitrix

Offering extra earnings. It is necessary to finalize the unloading of 1c-bitrix. All the reference books, including. Nomenclature, transferred from 1c UT to the UNF of the latest version. The site on Bitrix is also updated to the latest version. From the old UT to the old bitrix, unloading goes without problems, and from the new UT to the new bitrix, everything is unloaded with one feature - sections in the infoblock remain as they should, but the URLs of the goods cards change according to their rules, and not remain the same. For example, the product card has three sections of the catalog - chairs on a metal frame, designer and plastic. After unloading, the card is displayed in all 3 sections, but when we fall into it, it opens in the design instead of the section on the metal frame.
Almost every product card is linked to several sections and the URLs do not remain the same.
If the product card has 1 section, then it certainly falls only in this section and there are no questions about the URL.
The situation is 100% solvable, because the old UT without problems stably unloaded and unloads the product cards in the same URL. Especially for debugging left and UT, and UNF, and the test on the new bitrix and reserve on the old bitrix.
I will show you more details about the scoring.
Set up the unloading from the UNF to the bitrix with the preservation of old URLs and offer a solution where and how to set the binding to the main section when creating a new product card.