I started a RoG save as Warly a little while after the last update and now it's winter. It plays the winter music, it has the winter lighting, I'm as vulnerable to freezing as any other winter, and several flocks of pengulls spawned the way they usually do in winter, but I'm still seeing redbirds and butterflies spawning. Also, it's hard to be sure, but I think grass, saplings, mushrooms, and berry bushes are growing back even though that's not supposed to happen.
Start a RoG save as Warly and begin the game in autumn. Survive until winter and go to a place that has flowers. Look at some birds and berry bushes.