XPath expression has unexpected result

Consider the following query

variable $x:=<y><a/></y>;
insert node <b/> into $x/a;
rename node $x/a/b as "a";
(
<ev>
{
$x
}
</ev>,
<first>
{
$x//a
}
</first>,
<correct>
{
$x//*
}
</correct>
)

All nodes seem to have the isRecursive flag set to false , thus this query returns:

<ev>
  <y>
    <a>
      <a/>
    </a>
  </y>
</ev>
<first> <--only 1 a element since the first a is marked as nonRecursive
   <a>
     <a/>
   </a>
</first>
<correct> <--two a elements
   <a>
     <a/>
   </a>
   <a/>
</correct>