SplDoublyLinkedList::IT_MODE_LIFO unsets wrong key

bug.php

<?php

$list = new SplDoublyLinkedList();
// Comment this out to make it behave.
$list->setIteratorMode(SplDoublyLinkedList::IT_MODE_LIFO);

$list->push('one');
$list->push('two');

foreach ($list as $key => $value) {
  if ($value === 'one') {
    unset($list[$key]);
  }
}

// Also note that 'two' gets re-keyed to 0 (but that seems to be expected behavior).
$expected = array('two');

echo "-- Actual result:\n", var_dump($list), "\n";
echo "-- Expected result:\n", var_dump($expected), "\n";

result

$ php bug.php
-- Actual result:
class SplDoublyLinkedList#1 (2) {
  private $flags =>
  int(2)
  private $dllist =>
  array(1) {
    [0] =>
    string(3) "one"
  }
}

-- Expected result:
array(1) {
  [0] =>
  string(3) "two"
}

Related, but different: https://bugs.php.net/bug.php?id=63154