Check your Transporter version. We noticed that the issue occurs only in the latest version (1.4) of Transporter, and not in older versions such as 1.3.4 or 1.3.3. Try downgrading to an earlier version of Transporter and check if the issue persists.

If you prefer to use the latest version of Transporter (1.4), you should also update to the latest version of the Square In-App Payments SDK. I believe this will help resolve the issue.