Here are the entirety of the progressions that have been made to the guide in Fortnite for the v12.20 update.
Epic are known for making changes to the Fortnite map, which can be major or minor. Right now will be changes made to the guide contingent upon the decision the network make for the Agents Skin Styles, either Shadow or Ghost.
In the v12.10 update, most of the network picked Shadow for the Brutus Skin, which implies that the Grotto got refreshed with Shadow Symbol on the Cliff, which can be seen beneath:
The Rig Changes
The Rig has now exploded and you can see that there is more oil spillage in the ocean. Upon first glance you can’t tell if Shadow or Ghost won, but when you land at this POI, you will find Shadow Henchmen, meaning Shadow has won again.