Wrong author displayed in diff when removing latest version of a document

Reproduction steps:

• Create 2 users Foo and Bar and gives them Admin right
• Create a document with Foo and perform several editions to have different revisions
• Login with Bar, perform one edition and save
• With Bar, remove latest revision that has just been created
• Look at the history and display the diff between the two latest revisions

Expected result:

• Latest revisions are both made by Foo since the only revision made by Bar has been deleted
• The diff does not display any change on the authors

Obtained result:

• The history view displays properly that each revision is created by Foo
• However when looking at the diff the final revisions seems to be created by Bar
• The diff displays an author change (see screenshot)