https://bugzilla.wikimedia.org/show_bug.cgi?id=34873

Graham87 <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
                 CC|                            |[email protected]
         Resolution|FIXED                       |
            Summary|contributions of no longer  |problems listing
                   |valid username are not      |contributions for users
                   |listed anymore              |whose edits are attached to
                   |                            |multiple user ID's

--- Comment #3 from Graham87 <[email protected]> 2012-03-02 07:01:33 UTC ---
I was the one who originally noted this bug at the technical village pump:
http://en.wikipedia.org/wiki/Wikipedia:Vpt#Contributions_lists_for_truncated_IP_addresses_don.27t_work_anymore

I did some more testing today and discovered more cases where the contributions
are no longer listed properly, because the user's edits are attached to more
than one userid in the database. This usually happens because the edits were
imported from the UseModWiki database in September 2002 under user ID 0
(because the accounts didn't exist then), and then other edits were imported
from the Nostalgia Wikipedia later or the account was compromised. Compare
this:
http://en.wikipedia.org/wiki/Special:Contributions/LarrySanger

with this:
http://nostalgia.wikipedia.org/wiki/Special:Contributions/LarrySanger

Also, the edits that are assigned to the username "0" from 2002 don't show up
with Special:Contributions either, presumably because they are listed under
several userids:
http://en.wikipedia.org/wiki/User:0
http://en.wikipedia.org/wiki/special:Contributions/0

The same is true of Conversion scrip:
http://en.wikipedia.org/wiki/Special:Contributions/conversion_script

This is also true of the truncated IP address 11.105, which has many many edits
due to a bug in the first version of MediaWiki (I created an account under that
name to avoid impersonation):
http://en.wikipedia.org/wiki/Special:Contributions/11.105

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