[2.0.5] changing of username with shared roster makes the user appear offline

I tried with ejabberd 2.0.5 and Tkabber SVN. I get your same problem, and ejabberd reports this error:

=ERROR REPORT==== 16-Nov-2009::17:20:55 ===
E(<0.592.0>:ejabberd_hooks:205) : {undef,  
                                   [{mod_roster,item_to_xml,
                                     [{roster,              
                                       {"badlop44","localhost",
                                        {"badlop","localhost",[]}},
                                       {"badlop44","localhost"},   
                                       {"badlop","localhost",[]},  
                                       "Bad LOP",both,none,        
                                       ["aaaaa"],                  
                                       [],[]}]},                   
                                    {mod_shared_roster,set_item,4},
                                    {mod_shared_roster,set_new_rosteritems,7},
                                    {ejabberd_hooks,run_fold1,4},             
                                    {mod_roster,'-process_item_set/3-fun-0-', 
                                     6},                                      
                                    {mnesia_tm,apply_fun,3},                  
                                    {mnesia_tm,execute_transaction,5},        
                                    {mod_roster,process_item_set,3}]}         
running hook: {roster_process_item,["localhost"]}    

I applied this simple patch:

--- a/src/mod_shared_roster.erl
+++ b/src/mod_shared_roster.erl
@@ -264,7 +264,7 @@ set_item(User, Server, Resource, Item) ->
                id = "push" ++ randoms:get_string(),
                sub_el = [{xmlelement, "query",
                           [{"xmlns", ?NS_ROSTER}],
-                          [mod_roster:item_to_xml(Item)]}]},
+                          [item_to_xml(Item)]}]},
     ejabberd_router:route(
       jlib:make_jid(User, Server, Resource),
       jlib:make_jid("", Server, ""),

With that, the problem is solved in ejabberd 2.0.5.

I also tried in ejabberd 2.1.0 and the problem doesn't appear in that version.