svn status powershell non-ascii characters problem

I have a weird thing going on in my powershell-script using svn commands. Following is an Powershell-Example Script:

    $svnOutput = svn status    Write-Host "Output when saved in a variable"    $svnOutput    Write-Host "Direct Output"    svn status

If I run this script (within the powershell-console), I get two different outputs, if one of the files have non-ascii-characters in the name (in my examples umlauts like üöä). This is the output

    Output when saved in a variable    ?    Test_äöü.txt    Direct Output    ?    Test_���.txt

I am working on a Windows Server 2022 with a VisualSVNServer Version 5.4.1. I already tested following ideas:

    chcp 65001    $svnOutput = svn status    $svnOutput    $OutputEncoding = [System.Text.Encoding]::UTF8    [Console]::OutputEncoding = [System.Text.Encoding]::UTF8    $svnOutput = svn status    $svnOutput    $svnOutput = & svn status | Out-String -Stream    $svnOutput    svn status > svn_status.txt    $svnOutput = Get-Content -Path "svn_status.txt" -Encoding UTF8    $svnOutput    $svnOutput = & svn status | Out-String -Stream    $svnOutput

But all of them give the same error.

PS: this also happends with other commands like

    $svnOutput = svn add . --force    $svnOutput

which results in:

    A    Test_���.txt

Using svn add . --force in the normal powershell, or even i a script works without any issues. Hopefully someone can help me here - thanks!