Hi. I have exactly the same issue, but with a normal sim (not a fairy). My sim has several reward traits that completely remove the need for the toilet and other basic needs. Free will is disabled, ...
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All of my played sims keep acting like they need to go to the bathroom when bladder need is fine, doing the tummy hold with the toilet thought bubble. They do it twice in a row. I cannot tell what pack this is an issue with but it started after the Adventure Awaits basegame update. Happens randomly as far as I can tell but definitely not because their need is low. They are not sick nor do they have a malady or food poisoning. They also keep trying to "line up" at outside toilets even when they are not on autonomy and do not need to use the bathroom. "line up" is what show in action queue with the outdoor toilet as the object icon.
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