Hello Jervey,

I Hope you are doing well,

Odoo uses wkhtmltopdf to generate PDFs. If the version of wkhtmltopdf on your server is not compatible, it may generate 0-byte PDFs.
Check the version (wkhtmltopdf --version). For Odoo 17, a version like 0.12.5 or higher is recommended.

or

If no specific issue can be identified:
1)Restart the Odoo service and clear the cache
2) Reinstall the module to ensure all XML templates and actions are loaded correctly.

I hope this msg finds you well.

Thanks & Regards
Kunjan Patel