Hello all, I explain this issue by an example.
- I changed the user name on 2 Jan 2018.
- Old name has no entries on CentralAuth.
- The new name entries on CentralAuth
- If we take a look at User rights log (with new user name) there's no entries
- If we take a look at User rights log (with old user name) there's entries and this entries should linked to the new name.
I've another example about user on bhwiki.
I think the impact of this issue already known.