After I used aspose (22.12) to convert the docx (file name is old. docx) file into a pdf file, I found some missing content and newline problems, as shown below
1673251891959.png (277.0 KB)
Later, I used the wps software to save old.docx as new.docx. After the conversion, everything was normal. The file is as follows:
new.docx (16.0 KB)
old.docx (18.4 KB)