Application trace in the error page for a Rails engine

I’m developing a Rails engine, and when debugging an error through the default Rails error page, I find that the Application trace shows nothing, while Framework trace and Full trace show the trace.

Is this intended for an engine?

Yes, Engines are considered part of the framework level rather than the application level. If I developed an engine and released it as a gem, you wouldn’t want my lines littering your application stack trace, right?