Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What is your current game version number? 1.48.94.1020
What expansions, game packs, and stuff packs do you have installed? All of them
Steps: How can we find the bug ourselves? Take an unspayed/neutered animal to the vet and try to get them spayed/neutered.
What happens when the bug occurs? If you take an unneutered animal to the vet and sign it up for a spay, when it goes in the surgery machine, it comes out immediately and never gets neutered.
What do you expect to see? The interaction completing and my animal getting fixed.
Have you installed any customization with the game, e.g. Custom Content or Mods? Not now. I've removed them.
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure
I tested this without mods too just to be sure, but basically, if you take your unfixed pet to a vet clinic to get it fixed, the pet goes into the machine, then out immediately and the scenario ends, without the pet being fixed or having the cone or even being charged money. So far I haven't tried it with a cat, or unfixing a fixed pet, or an animal that needs the surgery machine for another illness, but neutering your pet on your home lot with a high enough vet skill DOES work, as does taking a pet to the vet clinic for something that needs the exam table. I'll be testing out those other situations too, and report back here.
I want to say it probably started happening after the Get Famous patch but I'm not 100% sure.