As [[ https://de.wikipedia.org/wiki/Wikipedia:Fragen_zur_Wikipedia#Bearbeitungskonflikt_wird_nicht_angezeigt | 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:
- [[ https://de.wikipedia.org/w/index.php?diff=174484863&oldid=174484796&title=Benutzer_Diskussion:UweRohwedder | Benutzer Diskussion:Uwe Rohwedder ]] (using the old wikitext editor)
- [[ https://de.wikipedia.org/w/index.php?diff=174493884&oldid=174493568&title=Tobias_Hans | Tobias Hans ]] (using the VisualEditor)
This seems to be a recent phenomenon, ~~possibly related to the [[ https://www.mediawiki.org/wiki/Help:Two_Column_Edit_Conflict_View | 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.