When you’re navigating through the options under experiences, other options pop in and out as well as the main navigation side bar changing. “Outdated” could be not necessarily correct, but seems likely.
In the first link, the ‘Events’ option under Engagement is not visible, and the left main menu options change. I also verified that none of my installed extensions are causing this behavior.
This only occurs on group-owned experiences. The Events button stay and everything is fine if it’s a user-owned experience.