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The overwhelming majority of comments I read, and I wish that was true just for my company, it applies to majority of OSS as well rarely if ever catch a bug.

I see most of the discussion involve preferences, practices and names, rarely api and architecture, even less bugs.

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It's very hard to catch bugs in a code review. I manage it occasionally, but it's much more common that I'll be working on something else that touches on some piece of code that already passed review, and then I'll notice a bug, because I'm already thinking about how that module should work -- I have already loaded the relevant context into my head. Loading that context just to do a code review takes too long.

I very commonly catch inadvertent quadratic or even exponential algorithms in code reviews. The code normally will produce the right answer ... eventually.

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