hi! there are definitely no objects blocking the toilet. i've literally placed only a toilet in a 3x3 room and the sims still won't use it. i'm having a difficult time explaining whatever this bug might be because none of the factors make sense.
sometimes i'm able to rotate a toilet and the sims will use it. then they wont. sometimes if i delete a rug in the bathroom, they'll use it, but then later they wont. sometimes child sims can use the toilet and only adults can't. sometimes no life stages can! also, i am now unable to get my sims to cook. if i'm lucky, they'll get whatever they need to prepare out of the fridge and set it on a counter, but then the action cancels and they refuse to resume. it's the same animation i get as the toilet. i have multiple usable counters, but i can't get anything to work. i am having a similar situation with showers and cribs.
i have narrowed it down and this problem is only happening within a singular household. i have another household within the same world, and they are able to complete all actions fine.
i have cats in both households, but that's all. no kittens, puppies, or foals. thank you for your help. i apologize if i'm not making any sense! this is just so strange and i'm very confused.