@rnara Unfortunately, There are no other recommendations then provided above. To sum them up to get the correct rendering on my side I made the following actions:
Used the following code and the latest version of Aspose.Words for Java:
// Open a document
Document doc = new Document("in.docx");
// When text shaper factory is set, layout starts to use OpenType features.
// An Instance property returns static BasicTextShaperCache object wrapping HarfBuzzTextShaperFactory
doc.getLayoutOptions().setTextShaperFactory(com.aspose.words.shaping.harfbuzz.HarfBuzzTextShaperFactory.getInstance());
// Render the document to PDF format
doc.save("out.pdf");