According to this link ZF has created a working moonphase. I believe this is a first for a JLC (and maybe others)
https://www.intime02.co/jaeger-lecoultre/4699-master-ultra-thin-moon-zf-gen-vs-rep.html
https://www.intime02.co/jaeger-lecoultre/4699-master-ultra-thin-moon-zf-gen-vs-rep.html