Rebalance failed with reason {case_clause,{{ok,replica},{ok,replica}}} when rebalancing out a node which was failed over due to netwrok connectivity issues but it re-appears while rebalancing

Failing testcase
failovertests.FailoverTests.test_failover_firewall,replica=3,load_ratio=10

[ns_server:info] [2012-05-14 13:26:46] [ns_1@10.1.3.55:<0.3846.2>:ns_janitor:wait_for_memcached:286] Waiting for "default" on ['ns_1@10.1.3.50','ns_1@10.1.3.51','ns_1@10.1.3.52',
'ns_1@10.1.3.54']
[ns_server:debug] [2012-05-14 13:26:46] [ns_1@10.1.3.55:ns_bucket_worker:ns_bucket_sup:update_childs:91] Stopping child for dead bucket: {{per_bucket_sup,"default"},
<0.23773.0>,supervisor,
[single_bucket_sup]}

[ns_server:debug] [2012-05-14 13:26:46] [ns_1@10.1.3.55:<0.23773.0>:single_bucket_sup:top_loop:28] Delegating exit

{'EXIT',<0.23699.0>,shutdown}

to child supervisor: <0.23774.0>

[error_logger:error] [2012-05-14 13:26:03] [ns_1@10.1.3.50:error_logger:ale_error_logger_handler:log_report:72]
=========================CRASH REPORT=========================
crasher:
initial call: ns_vbucket_mover:init/1
pid: <0.29733.2>
registered_name: []
exception exit: {case_clause,{{ok,replica},

{ok,replica}}}
in function gen_server:terminate/6
ancestors: [<0.28176.2>]
messages: [{'EXIT',<0.19829.3>,
{exited,
{'EXIT',<0.29733.2>,
{case_clause,{{ok,replica}

,{ok,replica}}}}}},
{'EXIT',<0.19792.3>,
{exited,
{'EXIT',<0.29733.2>,
{case_clause,ok,replica},{ok,replica}}}},
{'EXIT',<0.15598.3>,
{exited,
{'EXIT',<0.29733.2>,
{case_clause,ok,replica},{ok,replica}}}}]