In the Underwater condo, the water level in the pool is lower than it appears. Visually, the water is about where it should be, but the swimmable area starts about where the pool floor starts to dip. This means that you can’t actually swim to the “surface” of the water. If you’re a small character, you can stand in the shallow end under where the water appears to be without being in swimming state.
I find it weird and I find myself avoiding my own pool thanks to this. I would love for this to be fixed.