Sims get drink then get into bath.

Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Quite a bit.
What is your current game version number? Completely up to date.
What expansions, game packs, and stuff packs do you have installed? Get to Work, City Living, Cats & Dogs, Seasons, Get Famous, Discover University, High School Years, Growing Together, Spa Day, Parenthood, Strangerville, Realm of Magic, Dream Home Decorator, Werewolves and most of the stuff packs.
Steps: How can we find the bug ourselves? Have a sim do it autonomously. 
What happens when the bug occurs? The sim will decide to get a glass of water and then go straight to getting into the tub afterwards.
What do you expect to see? The sim to just drink the drink normally. 
Have you installed any customization with the game, e.g. Custom Content or Mods? Yes.
Did this issue appear after a specific patch or change you made to your system? Yes, it started after I got Discover University & Spa Day.
Please describe the patch or change you made. I just got and installed the two new packs.

Since I got Discover University & Spa Day, I've noticed that my sims will decided to get themselves a drink and then get into the bathtub straight after which is really random and also annoying as they don't need to use the bath.