Usually if I see a byte folder, I just delete it from the habit. It's a habit I have to unlearn: what if there was only one folder among many, and Get Info also shows zero byte … hard to not just destroy the case.
This error is especially serious on hard drives (because they are slower) and when there is disk I / O happening. You can wait a good time to see some view of the size. Why can't it just say "calculation …"? Because it eventually seems to get it right (though I'm not sure).
I haven't seen null byte folders, but I've seen many wrong folder sizes since updating to macOS 1
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