Documentation Plugin - Index Topic not working after Restore

A few months ago I installed Discourse, added some topics as Index Topic in the Documentation Mode section. Everything worked as expected.
backed up everything, deleted the Digital Ocean account, etc.

A few days ago I installed Discourse again and restored everything from the backup file I created and everything is working, except for the Documentation sections. At first I thought maybe the issue was that I unlisted those index topics, but they were unlisted before I uninstalled everything and they were working, so that couldn’t be the issue. Still, I tried to list them, but no luck. The sidebar was still showing the categories and all that other stuff that is the default.

Then I decided to copy the original topic’s content and create a new topic with it, set it to Index Topic, and that one works. Also closed and unlisted like the one that’s not working, so closing and unlisting is not the issue.

It seems that in the restore process, something is breaking the documentation mode for some reason.