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Protect PDF feature produce wrong password for .Net 7 But NOT for .Net 4.8

I have created two WinForms a .net4.8 and .net7, with SAME code, 


in .Net 4.8 everything is Ok. you can open the PDF with the password you set. BUT in .net7 it protects the PDF file successfully But when you try to open the file with the right password it prompts as INVALID/wrong  password.



using var stream   = new FileStream(file, FileMode.Open);
var       source   = new PdfLoadedDocument(stream);
var       security = source.Security;
security.UserPassword  = pdfPassword;
security.OwnerPassword = pdfPassword;
source.Save(stream);