After inspecting the database, I found where is and how to fix the problem, but it is a many hours of work, so I will restore the entire site from backup before update. There are hundreds and maybe thousands of db table rows, containing the products attribute data part of which are missing and other (size terms with images) just need to be edited. What was caused this I can’t say, but it happened during the update of woocommerce or the theme, not sure.
Close the case! There is nothing more to be done in this case.
Regards!
