To be fair, I've had the extreme misfortune of working on Odoo code and I can understand why an LLM would struggle.

Yearly breaking changes but impossible to know what version any example code you find is related to (except that if you're on the latest version, it's definitely not for your version), closed and locked down forum (after several months of being a paying customer, I couldn't even post a reply, let alone ask a question), weird split between open and closed, weird OWL frontend framework that seems to be a bad clone of an old React version, etc. etc. Painful all around. I would call this kind of codebase pre-LLM slop, accreted over many years of bad engineering decisions.