[Bug]: deskew results in "empty" output file

[hatl]

Describe the bug

When running ocrmypdf on some files (all cropped in PDF Arranger), the output is broken.
The issue only occurs when adding the deskew flag.

I ran into this issue using the latest version of paperless-ngx.
see also: paperless-ngx/paperless-ngx#8375

Steps to reproduce

1. Run `ocrmypdf --jobs 6 -l deu --output-type pdf --rotate-pages --rotate-pages-threshold 12.0 --skip-text --clean --deskew  scan0003.pdf output.pdf`
2. output is broken

remove deskew and the output is fine

Files

scan0003.pdf
output.pdf

How did you download and install the software?

Ubuntu snap

OCRmyPDF version

16.6.3.dev8+gfe89be5d

Relevant log output

No response

[jbarlow83]

This appears to be related to a general issue with cropped page boxes in ocrmypdf.
The rather unusual mediabox for the input file has these dimensions
0 449.835616 249.069767 842

where typically the third number is 0.