What I meant is that this looks like the outside of two bathrooms, each having stalls and sinks inside. I haven't really seen any bathroom where the stalls are separated but the sinks are not.
If you're at a house, the sink is always behind the door which is the context this rings true to me. Or if you are waiting outside a commercial single occupancy bathroom. Those used to have men and women signs but today often times they're not gendered.
I went to one bar once that had private cubicles with no sink inside, and a shared sink for everybody.
I guess I've never seen a "cubicle" with a sink inside but I have seen single occupancy bathrooms.
For example, there may not be paper towels, just toilet paper and no bin. You wash your hands, dry them with toilet paper and then flush that down together with the rest.
Of course, I know what you said is what people think so my route is: Do the business -> Wash hands -> Dry with TP -> Flush the TP together with the rest -> Wait hand-washing equivalent amount of time -> Exit.