You made the mistake of looking at the code, though. If you didn't look at the code, you wouldn't have known those bugs existed.

fixing code now is orders of magnitude cheaper than fixing it in month or two when it hits production.

which might be fine if you're doing proof of concept or low risk code, but it can also bite you hard when there is a bug actively bleeding money and not a single person or AI agent in the house that knows how anything work