I was trying to bubble up an error that my service passes my workflow by using a FaultHandler Activity, when I noticed that the Fault property was acting quirky. At first I could not set the fault because it was grayed out, however I noticed that the "Promote Bindable Properties" was enabled. After clicking it, a dependency property was created however I was still getting errors.
While trying to research this issue I noticed the following MS Feedback that someone posted just four days ago. Hopefully MS will respond with a workaround here soon! I'll keep ya posted.