Did you lose uploads? What plugins did you lose?
The only things that it can conceive of that are not in the database are uploads, which you can back up before an upgrade according to the documents you referenced.
I have categories that I only give access to certain groups.
I want those connected to the group to be able to search the forum through Google.
The problem is that the category does not appear in the sitemap.
In the permissions I gave access to spiders but it does not help regarding the sitemap.
Only what I give access to guests appear in the sitemap.
what can be done?