In a few spots around the pool of the Resort condo, when viewed at the right angles, the terrain changes shape. In some spots this will cause the water underneath to be visible. I’d assume this is also in 0.8.8.1 as well.
Videos of it happening
It happening where you can see the water:
And here’s it happening in a different spot without water:
Adding this in after the fact- I don’t know if it’s related on a technical level, but they both have to do with water so I’m grouping this in with it. At both of the corners of the pool where the ground lowers, there are points where you can hit water and cause ripples and a splash sounds to be played, with no water visible.