After inserting the text, the file cannot be edited normally.

[yang-521]

file.pdf
This is the file after I inserted cjk text using page.insert_text, and then encountered an unknown error while editing in acrobat

When I replace the cjk with the helv this problem does not arise
But this sample does not show errors in other pdf editors, such as pdfxchange, so I do not know whether it is acrobat's error or mupdf's error