Hi Jan-Willem Gmelig Meyling yes you're right it's been reworked.

The main change is that we're switching to Byte Buddy as defualt enhancer (rather than Javassist) in Hibernate ORM 5.3, so I'm not sure if it's worth spending much time improving/fixing the Javassist based enhancer.

The option to use Byte Buddy was already available in versions 5.2.x, just not the default. Could you check if it's affected as well?

Thanks