Kerberos Dissector Issues

I'm trying to debug a Kerberos issue with PA_S4U_X509_USER padata, i.e. attempting to do S4U with a certificate. In the TGS-REQ I can see the correct padata-type (130) but this is marked as unknown and the dissector doesn't unpack the data. Is this a BUG or do I need to configure something? This is with Version 1.12.0 (v1.12.0-0-g4fab41a from master-1.12)