I edited an article today ([[:hu:Bismarck (csatahajó) ]]). When I intended to save my modifications, the "Two Column Edit Conflict View" warned me of a conflict with another editor. I have sent him a message, but he did not respond. I did not "save" my modifications yet!
Meanwhile I checked the differences between the two versions, and I noticed, that only I modified the article, the "other" editor did not. However, the article was somehow saved, with the name of the other editor, but the content was my modifications!
Here is the link to the differences: https://hu.wikipedia.org/w/index.php?title=Bismarck_%28csatahaj%C3%B3%29&type=revision&diff=22661743&oldid=22661703
The histrory says "2020. május 24., 15:22 Sepultura", which is incorrect, because editor Sepultura says he did not edit the article.
More importantly I recognize my text (under his name).