Why application get hangs for this specific document?
In the document, field tag '<fld>' within the paragraph comes without child elements.
Why this is a specific case/issue in our PowerPoint library:
The '<fld>' tag will always have the child elements when
created with Microsoft PowerPoint. Even when we re-save this customer
reported document with Microsoft PowerPoint document, the <fld>
tag is added with some child elements.
So when we try to parse these field elements, the method gets looping due to the missing of child elements.