Some PDFs become unreadable after OCR with ABBYY FREngine 11

Hi

We are currently using ABBYY FineReader Engine 11.1.14.707470 with Linux with the Java-API  (com.abbyy.FREngine.jar).
Almost all PDFs are processed correctly, but when OCR-ing the attached PDF it becomes unreadable

We use the folllowing code to perform the OCR

import com.abbyy.FREngine.Engine;
import com.abbyy.FREngine.FileExportFormatEnum;
import com.abbyy.FREngine.IDocumentProcessingParams;
import com.abbyy.FREngine.IEngine;
import com.abbyy.FREngine.IFRDocument;
import com.abbyy.FREngine.IFRPage;
import com.abbyy.FREngine.IFRPages;
import com.abbyy.FREngine.IPDFExportParams;
import com.abbyy.FREngine.PDFExportScenarioEnum;

public class ABBYY {

    public ABBYY() {}
    private IEngine engine = null;

    public void Run(String inputfilename, String dllFolder, String developerSn, String languages) throws Exception {
       
        // Load ABBYY FineReader Engine
        engine = Engine.GetEngineObject(dllFolder, developerSn);

        try {
            // Setup ABBYY FineReader Engine
            String profile = "DocumentConversion_Accuracy";
            engine.LoadPredefinedProfile(profile);

            // Process PDF
            processPDF(inputfilename, languages);
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            // Unload ABBYY FineReader Engine
            engine = null;
            Engine.DeinitializeEngine();
        }
    }

    private void processPDF(String inputfilename, String languages) {
        String imagePath = inputfilename;

        try {
            // Create document
            IFRDocument document = engine.CreateFRDocument();

            /*
                If orientation detection is performed during document processing
                (IPagePreprocessingParams::CorrectOrientation property is TRUE), you can select fast
                orientation detection mode: set the OrientationDetectionMode property of the
                OrientationDetectionParams object to ODM_Fast.
             */
            IDocumentProcessingParams dpp = engine.CreateDocumentProcessingParams();   
            dpp.getPageProcessingParams().getPagePreprocessingParams().setCorrectOrientation(true);
            // Agressive text-selection
            dpp.getPageProcessingParams().getObjectsExtractionParams().setEnableAggressiveTextExtraction(true);
            dpp.getPageProcessingParams().getObjectsExtractionParams().setDetectTextOnPictures(true);
            // Set language
            dpp.getPageProcessingParams().getRecognizerParams().SetPredefinedTextLanguage(languages);
            dpp.getPageProcessingParams().getRecognizerParams().setLanguageDetectionMode(com.abbyy.FREngine.ThreeStatePropertyValueEnum.TSPV_Yes);

            try {
                // Add image file to document
                document.AddImageFile( imagePath, null, null );

                // Remove empty pages from inputfile
                boolean hasEmptyPages = false;
                IFRPages pages = document.getPages();
                for (int p = (pages.getCount() - 1); p >= 0; p--) {
                    IFRPage page = pages.getElement(p);
                    if (page.IsEmptyEx(null, null, null)) {
                        pages.DeleteAt(p);
                        hasEmptyPages = true;
                    }
                }
                if (hasEmptyPages) document.Synthesize(null);

                // Process document
                document.Process(dpp);

                // Save results to pdf using 'balanced' scenario
                IPDFExportParams pdfParams = engine.CreatePDFExportParams();
                pdfParams.setScenario( PDFExportScenarioEnum.PES_Balanced );

                /*
                    Specifies whether a linearized PDF file should be created. Linearized PDF files have internal data
                    arranged in a page order. A page of a linearized PDF file can be read in a web browser plug-in
                    without waiting for the whole file to be downloaded. Non-linearized PDFs have the data
                    necessary to assemble a document page scattered through the whole file. Non-linearized
                    PDF files are smaller, but they are slower to access.
                    Note: This property makes sense only for multipage PDF files. If the property is set to TRUE and
                    a one-page document is exported, a nonlinearized    file is created.
                    This property is FALSE by default.
                 */
                pdfParams.getPDFFeatures().setEnableLinearization(true);

                String pdfExportPath = inputfilename + "_ocrred.pdf";
                document.Export( pdfExportPath, FileExportFormatEnum.FEF_PDF, pdfParams );

            } finally {
                // Close document
                document.Close();
            }
        } catch( Exception ex ) {
            ex.printStackTrace();
        }
    }
}

Which parameters do we need to set in our Java-code to prevent this issue?
Any suggestions within the settings of FREngine itself?
Or is this a known issue in FREngine 11 and to be or already fixed in a more recent version?

Many thanks in advance

Koen de Leijer