Thank you for reporting this. I just logged a bug report in our feedback portal where you can subscribe to be notified for any status updates. In appreciation of the report, I have increased your Telerik points.
A possible workaround to achieve non-editable interactive form fields would be to implement flattening using RadPdfProcessing library. Please, find the attached demo with sample implementation for flattening form fields.
Hope this is helpful.
Regards,
Georgi
Progress Telerik
Want to extend the target reach of your WPF applications, leveraging iOS, Android, and UWP? Try UI for Xamarin, a suite of polished and feature-rich components for the Xamarin framework, which you to write beautiful native mobile apps using a single shared C# codebase.