This is what I get:

empty workspace!!
Switched back to workspace 1
$VAR1 = bless( {
                 '_ae_sent' => [
                                 [
                                   {
                                     'success' => bless( do{\(my $o = 
+1)}, 'JSON::PP::Boolean' )
                                   }
                                 ]
                               ]
               }, 'AnyEvent::CondVar' );
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However no switching occurs. No clue what is going on there...