It happens all the time. That white icon someone posted a pic of earlier gets stuck literally in every game session. I usually just ignore it or shift-click reset sim. It's kind of a very minor inconvenience that I never even thought of mentioning it. It's good that someone did.
It's the Sims though, we are used to such things. Sims suddenly drop the entire queue of interactions that I planned for them perfectly, they respond to some interactions too late, they get stuck, sometimes my sims get frozen all together in a lot because some item gets bugged, like a chair or whatever, and suddenly all sims freeze in default position, (standing arms and legs open like Da Vinci's drawing) then I have to figure out which interaction and which sim or pet caused it with which object and I need to reset both so the all other sims and pets turn back to normal, etc. these things happen all the time. I assume some of such bugs happen because I use move objects cheat a lot in almost all of my builds, so some items cause interaction errors so they get bugged, etc.
It's kind of the nature of the Sims games. Such stuff used to happen in TS2, and TS3 as well, we're accustomed to it. :)