I have just starting using Drupal today and am going through a tutorial for Drupal 7 (I am using Drupal 8). I have made several revisions; however, the `Revision` tab does not appear when in the `Edit` area. I am logged in as Admin and have permissions for everything. After several revisions I got fed up and decided to delete the node (content) by clicking the `Delete` tab - to my surprise, the `Revisions` tab then appeared to the right of the `Delete` tab. I cannot find any documentation on the `Revisions` tab only appearing once the delete button has been clicked. Is this standard behaviour or is there something that I am missing?