There was an in-product alert done on 2/26 about the assessed 10% penalty (see screenshot below) which links to this article https://accountants-community.intuit.com/articles/1813260-roth-conversions-being-assessed-10-penalty, the purpose of the hold is to prevent you from filing incorrectly, and in theory prevent you or your client from being penalized.  Once the return is released you can resubmit correctly.