Deleting a question in the Form editor now also removes the conditions on other questions that use it. Before anything is removed, the confirmation names each of those questions. A question left with no other condition will always show. Before, the Form could not be saved after such a deletion, and every later edit failed to save until the page was reloaded.
In the native app, removing a question or a page does the same when you save.
The published Form keeps its conditions until you choose Publish changes.