### Description of the bug <img width="703" alt="screenshot_6579" src="https://github.com/user-attachments/assets/ce8ff92b-d807-4232-bd05-bc56f4045ce6"> res may be bytes type ，so no "m_internal" attribute ### How to reproduce the bug [x.pdf](https://github.com/user-attachments/files/17710815/x.pdf) import fitz doc = fitz.open('x.pdf') doc.fullcopy_page(0) ### PyMuPDF version 1.24.13 ### Operating system MacOS ### Python version 3.12
