Me too!
I would have, but I cant replicate the issue now so it will be left a mystery.
The best explanation I can provide is…
Originally I had Category #1 with Sub-Category #1 inside it.
- Both have permissions for everyone to read/write.
Within Sub-Category #1 settings, I changed the parent to Category #2.
- Category #2 has permissions for Custom-Group with read, staff with read/write.
- Sub-Category #1 has no one under permissions.
When I tried to save changes I received an error saying that I cant save until I add permissions for at least one user. So instead of adding any, I went back to the home page, went to Category #2 and I couldn’t see Sub Category #1.
I also went back to Category #1 and I couldn’t find Sub-Category #1. This is where it should have been if I was unable to save the changes I would have thought.
I then used the search to find a topic within Sub-Category #1. I was able to see the topic. But when I tried to go to the Sub-Category #1 to view the other topics, I got the 404 error.
When I used safe mode, I was able to find the Sub-Category back where it was originally in Category #1.
Hopefully that helps somewhat.