Hello
Thank you for your question and reaching out. I can understand you are having issues related to sysprep.
Please try to repair Boot Record tom see the result, your sysprep steps should be ok.
Firstly, disable Secure Boot
Second, enter WinRE and Navigate to Troubleshoot > Command Prompt
Type the bootrec commands:
bootrec /FixMbr
bootrec /FixBoot
bootrec /ScanOs
bootrec /RebuildBcd
Press Enter after each command
Restart computer
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