We switched our region (on the RC-channel) to winter recently, and used fancy 2k PBR terrain textures. Yet the world map (web and inworld) still shows the region in summery green.

We switched it back to non-PBR textures, and dusted the highest level in snow, and then switched it back to PBR. The expectation was that maybe the world map uses the BlinnPhong textures. That was two days ago, and so far, the map has neither updated with a BP-snow-dusted hill range, nor with the full-on wintery PBR terrain.

My guess is that the world map is confused either by 2k and/or PBR textures.