It isn't clear that AI generated code is copyrightable, so that portion of the code wouldn't able to have the license enforced against violators, and so the authors wouldn't accept such code. Of course if its permissively licensed, the authors probably don't care to enforce the license, so might be fine including the code.

To submit the code, at minimum, you should review and fix the code diff, run the appropriate static analysis tools against it, write the pull request description and commit messages yourself, read the contribution guidelines, make sure everything matches that, disclose that you used AI and for what, and the prompts used.