Can't extract some images from PDF

[ericosmic]

I try to extract text from some PDF files, but found some images , mainly is title blocks, can not be correctly extracted.
one of bug files :
zf39.pdf
I used below code to extract image of PDF:

but result image is like some kind color point.
The extract results:

\

My pymupdf version: ('1.20.2', '1.20.3', '20220813000001')

[JorjMcKie]

This situation is a duplicate of your previously submitted issue / file. Please see discussion #2492.