When it comes to user’s privacy, Apple considers it the most important factor. If your app is going to use, user’s private data from his device then you are required to inform client through Privacy Policy and take the consent. In any case, violation of privacy policy will be a reason for rejection of your app.
Apple does not expect any crashes or bugs while reviewing the app to submit the app only when it’s thoroughly tested on all the devices and all the bugs are fixed. Any buggy application will hamper the review process and will, in turn, attract rejection. So instead of re-submitting after re-testing, better to invest time beforehand.