powershell foreach-object parallel - 并非管道输入对象的所有属性都可用

Question

考虑下面的代码

$users = get-aduser -filter $filter -properties samAccountName,lastLogonTimestamp
$users|foreach -parallel {
   [do something with $_.samAccountName]   # --> this works fine. samAccountName can be read properly
   [do something with $_.lastLogonTImestmp]    # --> this doesn't work. lastLogonTimestamp is always NULL regardless if it is actually populated

}

同样的问题阅读 whenChanged，whenCreated。我在这里想念什么？

注意：这个问题不是关于引用外部变量的。这是关于管道中对象的属性可见性，它应该在脚本块中完全可访问。

非并行风格中的相同代码工作正常

$users = get-aduser -filter $filter -properties samAccountName,lastLogonTimestamp
$users|foreach {
   [do something with $_.samAccountName]   # --> this works fine. samAccountName can be read properly
   [do something with $_.lastLogonTImestmp]    # --> this also always works

}