Executing GETFIELDIREF on a ref<T> does not error

I built a bundle (using the C API call-based IR-builder) that did what the title says; specifically it created a ref<T> via NEWHYBRID and then extracted a fixed-section field via GETFIELDIREF (without first converting to an iref using GETIREF). This caused an error in Zebu but did not do so on the reference implementation.