From what I read here on Meta, each category’s access is configured separately.
Here is the issue I experience:
- Create a category and limit it to admins only.
- Create a subcategory and limit it to admins and group1 - give read/write access to both.
- Create a use and put it in group1 (not the group owner).
- Log in as the newly created user and try opening the link of subcategory - it will say “oops”.