The timeline for Unified Interface is "broken". The hyperlink on the left side opens the user entity, when it should open the actual activity.

It makes no sense at all to hyperlink to the user entity. Read the blog for details.

https://crmkeeper.com/2020/08/12/dear-ms-could-you-please-just-fix-the-following-pretty-please%f0%9f%99%8f%f0%9f%a5%b0/