According to descriptions, Isa Lake only flows in two directions when the water level rises in spring. Two Ocean creek does flow in two directions, but it more seeps out of its meadow on the continental divide than actively splits as we often see in maps here.

Both features are small enough that they wouldn't be visible except on very small local scale maps. The general rules about rivers and lakes aren't affected and budding cartographers should still not be cut any slack for infractions.