So i can't do a perfect union between shipwrecked and RoG after the Hamlet launch.
There are only 2 seasons if i start on a RoG world (Autumn and Winter) and my world preferences aren't aplied.
Steps to Reproduce
Start a new RoG world and make it compatible with Shipwrecked with changes to the world preferences (something noticeable like no grass/ no trees).
This issue has not been confirmed by a developer yet.