Interesting. Thanks for the screenshot.
The messaging makes it sound like you should be able to “Show Hidden” in the console in order to see these hidden actions in-order to delete them. If so, then these are actions that would have been hidden by a Master Operator if that is the case.
There is a different type of “hidden action” that is not created by an operator the normal way and can’t be shown just by choosing to “Show Hidden” in the console.