Batch file has an error that when called from a Powershell script does not allow the batch file to finish?

If Alexey's solution doesn't work, you can try this one.

Invoke-Command -Session $session -Scriptblock {start c:\MSSQL\DBMaintenance\Mirroring\SERVER_Remove_Mirroring. Bat xssqlk02 ossqlk02 -wait}.

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