Aspose.PDF Java Getting com.aspose.pdf.internal.ms.System.l7k: Collection is of a fixed size Exception while replacing text in a PDF Document

Question

I am evaluating Aspose.PDF's Java API to redact PII data in my PDF files and replace them with obfuscated text. My PDF contains some data as follows:

• B, KATILDE
• A, RICHARD
• S, NARTURO

The order of appearance of these text values is same as in the PDF.

Here's my sample code:

private void replaceTextInDocument(String sourceDoc, String destDoc, String textToReplace, String replacementText) {
 Document pdfDocument = new Document(sourceDoc);
    System.out.println("replaceTextInDocument processing: " + textToReplace);

    // Create TextAbsorber object to find all instances of the input search phrase
    TextFragmentAbsorber textFragmentAbsorber = new TextFragmentAbsorber(textToReplace);

    pdfDocument.getPages().accept(textFragmentAbsorber);

    // Get the extracted text fragments into collection
    TextFragmentCollection textFragmentCollection = textFragmentAbsorber.getTextFragments();

    // Loop through the fragments
    for (TextFragment textFragment : (Iterable<TextFragment>) textFragmentCollection) {
      // Update text and other properties
      textFragment.setText(replacementText);
      textFragment.getTextState().setFont(FontRepository.findFont("Verdana"));
      textFragment.getTextState().setFontSize(8);
      textFragment.getTextState().setForegroundColor(Color.getBlack());
      textFragment.getTextState().setBackgroundColor(Color.getWhite());
      }
    // Save the updated PDF file
    pdfDocument.save(destDoc);
    pdfDocument.close();
  }

Now interestingly, this code is able to replace to 'B, KATILDE' with replacementText. However, when I try to replace other two values (A, RICHARD or S, NARTURO), I get the following exception:

Exception in thread "main" com.aspose.pdf.internal.ms.System.l7k: **Collection is of a fixed size**
    at com.aspose.pdf.internal.ms.System.ly$lb.removeAt(Unknown Source)
    at com.aspose.pdf.ADocument.lI(Unknown Source)
    at com.aspose.pdf.CharInfoCollection.copyTo(Unknown Source)
    at com.aspose.pdf.l19y.lI(Unknown Source)
    at com.aspose.pdf.l19y.lf(Unknown Source)
    at com.aspose.pdf.TextFragment.lf(Unknown Source)
    at com.aspose.pdf.TextFragment.setText(Unknown Source)

I am able to replace RICHARD or NARTURO successfully.

I am using v23.7 of the Aspose Library. Snippet from build.gradle:

 implementation group: 'com.aspose',  name: 'aspose-pdf', version: '23.7'

It's very difficult to debug the Aspose code using IDE. So, I am unable to get more information about this issue.

Any help or pointers to resolve this issue would be helpful.

Thanks