Private timeline events have returned to the sidebars of all linked articles, regardless of subscriber group access. They appear even when logged out.
1. Create Timeline Event (Mine were created on the Legacy Timelines, as all of these events predate the new system) 2. Mark it private 3. Link it to other article types (organization, character, it doesn't seem to matter) 4. Log out and go to the linked article, and it's there in the sidebar, even though you shouldn't be able to see it.
This is an older bug that has been fixed in the meantime. Please check and confirm so I can close this report.
Scratch that, I misread the report. Maybe it's too early in the morning for me to be reading the bug board...