Thanks @Holosim_Cav , now I see the problem.
It seems that those blueprints just aren’t hooked into other assets or the Editor itself. If I remember right, they were part of UE4 Starting Templates which aren’t present in UE5 anymore (I might be wrong though).
These are derived from UObject under the hood (not UActorComponent or AActor) so I’m not sure how are they supposed to be initialized. I believe they were supposed to be part of Editor’s UI.
I have debugged what pressing at “Launch” button does and it leads to this function - FIntroTutorials::LaunchTutorial - however, on my side it always fails due to RootWidget being invalid.
EDIT: I just reported this issue to the Unreal’s bugtracker. Will inform in case of getting any response.