errors not caught if raised during temp index creation

Errors might not be caught by a try-catch expression if they are raised during the creation of a temporary index. The following example should return "caught" but instead the error is propagated up.

declare function local:foo() as element()*
{
  for $i in 1 to 10
  return if ($i mod 2 eq 0) then <a id="{$i}"/> else fn:error()
};

declare function local:bar() as element()*
{
  for $i in 1 to 10
  return <b id="{$i}"/>
};

try {
  for $i in local:bar()/@id
  for $j in local:foo()/@id
  where xs:string($i) eq xs:string($j)
  return $i
} catch * {
  "caught"
}