Technically that is a limitation in Form Builder. We will address that problem in the next update to Form builder. Really any of our server behaviors that offer a redirect option will have this issue. Each will have to be updated individually in order to become more portable and work with framework builder. This applies to Universal Email, Form Builder, DataAssist, SecurityAssist, and eCart. A similar work around can be used in the meantime to make the redirect code more portable, we can't actually fix that in Framework builder itself.