I realize that there isn't much to go on yet. I'll update this report if I catch it happening. But I've noticed that occasionally, my Sim will use a toilet in one restroom, and will then go to a sink...
Ideas
This may be a symptom of a more general bug with routing when moving between related tasks.
After hosting a house party, I had my Sim clean up (click on a dirty dish and select Clean Up). She wandered around picking up dirty dishes, but she wasn't at all efficient about it. Pick up a glass in one room, pick up a dish from a table in another room, pick up a glass in a third room, pick up a dish from a different table in the second room, pick up another dish from the first table in the second room, pick up another glass in the first room, and so on. I would expect her to pick up all the dirty dishes from one table, or in one room, before moving on to the rest of the house.
I'll try to capture this behavior if I see it again. I haven't seen the original behavior (using toilet, going to a sink in another room to wash hands) for a while though.
I just saw it happen again. Talking with a new neighbor, ran inside to use the restroom, ran downstairs to use the sink, ran back out to continue talking with the new neighbor.
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