At least in 1.20.1, when the constructor is generated, a call to createAdapterWrapper is added, but because the Context parameter was added to createAdapterWrapper, the call fails. https://github.com/KubeJS-Mods/Rhino/blob/main/src/main/java/dev/latvian/mods/rhino/JavaAdapter.java#L451

There's maybe more beyond this that's not working, too. If I get a chance I'll try to hack it into working and see what else is needed.