Sounds typical Sims 4 to me. All visitors to my Sims homes immediately empty the trash and then go and play on their computer's. Occasionally they will stop to read a book. But there's no autonomous social interactions unless I force it.
However this is the same game where my sim got caught cheating by his girlfriend's Husband, started telling jokes to the husband and then once I made my sim throw a drink on the husband in order to get some kind of realistic response to woohooing with his wife, the Husband proceeded to stick around for hours after playing on his pc and thanked my sim for a nice time when he left.
Weirder stories or rubbish AI? Answers on a postcard.