[orbitalw]

    sub return {
        return "\$context->throw('return', '', \\\$output);";
    }

    sub stop {
        return "\$context->throw('stop', '', \\\$output);";
    }

There is a long-known problem from the TODO list:

* Errors thrown via the Error module are not correctly caught.  I looked
  at this briefly but the problem wasn't immediately obvious and needs some
  more considered investigation.  There are also problems with CGI::Carp
  throwing errors that don't get properly caught.

I believe the problem lies in modules (non-TT modules that is) that blindly
redefine $SIG{__DIE__} and/or $SIG{__WARN__}.  Presumably, these modules
attempt to intercept all warn/die calls but don't give any consideration to 
the fact that your program (or other modules) might be relying on those 
calls for correct execution.

I suspect that some other module that you're using is trapping $SIG{__DIE__}
and turning a perfectly harmless RETURN into a confess().

HTH
A