Same issue: Traveled from home world Willow Creek to any lot on Mua Pel'am, and then another lot on Mua Pel'am and then went to the waterfall, like this:
Key Point > Caldera Camp
Key Point > Admiral's wreckage
Caldera Camp > Key Point
Caldera Camp > Admiral's wreckage
Admiral's wreckage > Key Point
Admiral's wreckage > Caldera Camp
all 6 trips made the waterfall and a sim showering in it look like this:
Traveling home, as well as to different lots on Ohan'ali Town (The Sand Bar, Ohan'ali Beach, Lagoon Look), and then back to the Island Mua Pel'am (just one lot), reset the waterfall to look like white water, and the sim showering in it looked ordinary:
Traveling from Willow Creek to Ohan'ali Town and then to Mua Pel'am did not make the waterfall green.
