As reported here in at least the following two cases, the editor making the edit was not notified about an edit conflict and the changes made by the previous editor were lost:
- Benutzer Diskussion:Uwe Rohwedder (using the old wikitext editor)
- Tobias Hans (using the VisualEditor)
This seems to be a recent phenomenon,
possibly related to the Two Column Edit Conflict View. (I asked the editors whether they are activated this Beta feature.) In the first example, the editorhad not activated the feature, while in the second example, the editor had.