setValue lose value of key saved inside handler of installationFinished signal during uninstallation

function Component()
{     
   installer.installationFinished.connect(SaveMsiGUID); 
}

 Component.prototype.createOperations = function()
{
    try {
        component.createOperations();
        var FSNT_HOME = installer.value("FSNT_HOME");
        var JAVA_HOME = FSNT_HOME + "\\jre";
        installer.setValue("JAVA_HOME", JAVA_HOME);

        var arguments =
        [
            "msiexec" , "/i",
            FSNT_HOME + "\\bellsoft-jre17.0.3.1+2-windows-amd64.msi",
            "INSTALLDIR=" + JAVA_HOME + "\\",
            "/quiet"
        ];

        var undoArguments =
        [
            "msiexec" , "/x",
            installer.value("JAVA_GUID"),
            "/norestart",
            "/quiet"
        ];
        
        component.addElevatedOperation("Execute", arguments,"UNDOEXECUTE",undoArguments);

    } catch (e) {
        console.log(e);
    }
}

 function SaveMsiGUID()
 {
     var FSNT_HOME = installer.value("FSNT_HOME");
  
     var arguments =
     [
         "powershell.exe", `${FSNT_HOME}\\GetGUIDfromMSI.ps1`,
         `${FSNT_HOME}\\bellsoft-jre17.0.3.1+2-windows-amd64.msi`
     ];
     var result = installer.execute(arguments.shift(), arguments);

    installer.setValue("JAVA_GUID", result[0]);
     console.log(`GUID of package ${component.name}: ${installer.value("JAVA_GUID")}`);
 }