Hey,
Not sure if this thread is dead, but, this has happened to me as well! The cat refused to eat until I called him to it, wouldn't use his litter box, wouldn't go to sleep...
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? n/a
What expansions, game packs, and stuff packs do you have installed? All, up to and including Realm of Magic.
Steps: How can we find the bug ourselves? Have a lit fireplace on the lot, have a pet with the "Obsessed with fire" hidden trait.
What happens when the bug occurs? The pet keeps obsessing over / investigating the fireplace and does not tend to its needs.
What do you expect to see? The obsession interaction to happen every now and then, but not spamming in a loop; the needs should be more important than the obsessive behaviour.
Have you installed any customization with the game, e.g. Custom Content or Mods? Not at the time I found the bug.
Did this issue appear after a specific patch or change you made to your system? Neutral/Not Sure
Eventually I installed a mod that allows me to control pets to force him to take care of himself (just to be clear, I added the mod *after* I noticed the bug, so that wasn't the cause) but still the "Obsess - Investigate" interaction keeps spawning in a loop, even if he's hungry / drowsy / etc.
Here is the save file: https://drive.google.com/open?id=1cx5C48F0H1DNKEdGLC4CSOYFR_e5v0sT
And I'm including a screenshot as well showing the interaction: https://drive.google.com/open?id=1Jc8m_bv9Tz9HVozppKTJPC86EcGG3alm