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, ...
Ideas
I'm having this issue but with JUST the bladder need. Both of my sims in the same household bladder need won't decay at all. I think I noticed this after I gave them the steel bladder reward, which says "rarely have to pay attention to their Bladder need". Both my sims should still have gradual decay of their Bladder need, but it has been permanently filled to max since I gave them both this reward.
The weird thing is, they still get the bubble over their head saying they need to go every once in a while and then proceed to go to the bathroom but then the action cancels, I'm assuming, because the need is already full.
I included a screenshot which shows her with the toilet emote, making a tummy ache motion on her belly, and her automatically lining up to go to the closest bathroom. Then as soon as she walks in, she walks out and the action cancels. You can clearly see her bladder need maxed out.
I've already reinstalled the game, and repaired it, and cleared the cache. I will test this out on a new save and my old files as well and update below here.
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