As reported today (permalink) on the German-language Wikipedia's feedback page, when editing an old version of a page, the VE's saving dialog shows the diff with that old version, not the most recent version.
Steps to reproduce:
- Go to the article about Annalena Baerbock and observe that Robert Habeck is mentioned in the second sentence of the article.
- Go to the page history and open an old version from July or earlier, e.g. this one. Observe that Robert Habeck is not mentioned in the second sentence.
- Now open the old version for visual editing, make some random changes to the first sentences, go to the save dialog ("Änderungen veröffentlichen" in the upper right-hand corner) and click on "Überprüfe deine Änderungen" at the bottom of the dialog.
- Inspect the diff and verify that the left column, despite claiming that it shows the current version ("Aktuelle Version"), actually shows the old version:
- Go back to the old version of the article without saving anything and open the article in wikitext edit mode.
- Make the same change and click on "Änderungen zeigen" at the very bottom. Observe that here the diff is shown between the actual current version (where Robert Habeck has been added) and the edited version: