PowerShell 5.1仅复制目录结构，指定扩展名文件无法复制

我正在编写PowerShell 5.1脚本，需将本地（源端）服务器指定目录的结构及文件复制到远程（目标端）服务器，要求仅复制.p12、.properties、.pem等指定扩展名的文件，且满足以下任一条件时执行复制：

• 目标端不存在该文件
• 源文件的修改时间晚于目标端文件

目前遇到的问题是：目录结构已成功复制到目标端，但指定扩展名的文件并未被复制过去，已花费近10小时排查原因，相关代码如下：

foreach ($fileS1 in Get-ChildItem $RootFolder -Recurse) {
    $FolderNameS1 = $fileS1.FullName
    $FolderNameNewS1 = $fileS1.FullName

    # check if the path on the remote session exists
    $ValidPathS1 = Invoke-Command -Session $Session1 -ScriptBlock { 
        Test-Path -Path $using:FolderNameNewS1 
    } 

    If ($ValidPathS1 -eq $False) {
        #create the folder structure
        if ($fileS1.PSIsContainer -eq $True) {
            Invoke-Command -Session $Session1 -ScriptBlock { 
                New-Item -Path $using:FolderNameNewS1 -ItemType Directory -Verbose
            } 
        }
    }

    # Get the files in the source folder
    $sourceFiles = Get-ChildItem $FolderNameS1 -Recurse
    # Get the files in the destination folder
    $destinationFiles = Invoke-Command -Session $Session1 -ScriptBlock {
        Get-ChildItem $using:FolderNameNewS1 -Recurse
    }

    # Compare the last write time of each source file with the last write time of its corresponding destination file
    $extensions = "p12", "properties", "pem"
    foreach ($sourceFile in $sourceFiles) {
        if($extensions -contains $sourceFile.Extension){
            $fileCopied = $False
            # check if the file on the remote session exists
                $destinationFilePath = Invoke-Command -Session $Session1 -ScriptBlock {
                $destFilePath = Join-Path $using:FolderNameNewS1 $using:sourceFile.Name
                if(!(Test-Path $destFilePath)){
                    New-Item -Path $destFilePath -ItemType File -Force
                }
                return $destFilePath
                }
            if($destinationFilePath -ne ""){
                $destinationFile = Invoke-Command -Session $Session1 -ScriptBlock {
                    Get-Item $using:destinationFilePath
                }
    
                $remoteFileExist = Invoke-Command -Session $Session1 -ScriptBlock { 
                Test-Path $using:destinationFilePath
                }

            if(!$remoteFileExist){
                Copy-Item $sourceFile.FullName -Destination $FolderNameNewS1  -ToSession $Session1 -Force -Verbose 
                }
            else{
            $remoteLastWriteTime = Invoke-Command -Session $Session1 -ScriptBlock { 
            (Get-Item $using:destinationFilePath).LastWriteTime
                }
            $remoteLastWriteTime = $remoteLastWriteTime.ToLocalTime()
            # Compare the last write time of source file and destination file
            if ($sourceFile.LastWriteTime -gt $remoteLastWriteTime) {
            #copy only the files with the specified extensions
            if($extensions -contains $sourceFile.Extension){
            Copy-Item $sourceFile.FullName -Destination $FolderNameNewS1  -ToSession $Session1 -Force -Verbose 
            $fileCopied = $True
        }
    }
}
            if ($fileCopied -eq $True) {
                #remove the source file
               # Remove-Item $sourceFile.FullName -Force -Verbose -ErrorAction SilentlyContinue
                $fileCopied = $False
            }
        }
    }
    }

注：使用PSSession远程连接目标服务器，$RootFolder为源端的根目录。

内容的提问来源于stack exchange，提问作者Freshzak187