Version 0.50.19 (not mentioned in bug fixes of 0.50.20).
If you create a question on a table or view, that table/view then appears in the history when you create a new question (correctly).
If you then change the table/view to be not visible, it still appears in the history list when you create a new question.
Clicking the table/view takes you back to 'Pick your starting data'.
I think this has been a bug for a long time but is more of an issue now that history is more visible.