プライベートタググループの投稿が、ダイレクトリンクを持つ未ログインユーザーに表示される

[JammyDodger]

The tag group visibility only affects who can see the tag once it’s applied, not who can see the topic itself. To restrict topic visibility you would need to place it in a category with group permissions:

Understanding groups and category permissions (security settings)

See this video tutorial for an example of how to use these features: Create a private category with limited access for a certain group The Security tab on the category edit page is used to control both the visibility of categories and what users can do in a category. This is done by defining an access list of groups that associate a group name with an access level. The default permission for a new category is that the group everyone can Create/Reply/See. This means that a…