Thank you for your valued feedback. We are aware of this issue and our developers are working hard to fix it.
The experience you described has been identified and is being addressed by the development team for users who need to enter a foreign address on their tax return.
Take a look at the following TurboTax help article for an opportunity to register your email address and receive updates as they become available.
Why am I unable to enter a US billing address when trying to pay?