Extracted text mismatch the vision

[rcx986635]

Description of the bug

I use the code to extract text:

import pymupdf
doc=pymupdf.Document('a.pdf',filetype='pdf')
out_text = pdf[0].get_text()

then I got '!"#$%&'()*+,-\n2023研究工作汇报\n汇\n报\n人\n：\n刘\n璘\n'

But the excepted result is '工业安全大数据联合研究中心\n2023研究工作汇报\n汇\n报\n人\n：\n刘\n璘\n'

Here is the original pdf:
研究中心工作汇报_page_0.pdf
Is there any config I should change? @JorjMcKie Thank u for your reply

How to reproduce the bug

I used pip to install PyMuPDF 1.24.7

PyMuPDF version

1.24.7

Operating system

Linux

Python version

3.8

[JorjMcKie]

The file link does not work.
But presumably not a bug:
Confirm via page.get_text(flags=0). If you see � symbols in the output, then the font's backtranslation table is missing or incomplete, This flags prevents MuPDF effort to heal this by providing a Unicode derived from the glyph number.

I suppose my assumption is correct, so going to close the issue.