I've been having this issue basically since I installed Sims 4 (not long ago), and resetsim works... usually.
So basically, occasionally an action will get stuck in the queue. Could be anything, like claiming a bed or doing homework or whatever. And for most actions it doesn't actually affect the game or the sim at all, and I can get rid of it with resetsim. Also, sometimes, and I dunno if this is relevant or not, when a sim has been doing something that gets a Skills progress bar above their head (i.e. playing chess or working out) that progress bar doesn't go away after they stop but, again, resetsim works.
However, one of my Sims got 'take photo with John' stuck in her queue and now the game thinks it's taking a photo... so it won't let me save, or go to build mode, or travel, or anything really at all which means that I lose all progress since the last save. Please, someone tell me how to deal with this; I really don't want it to happen again.
It hasn't actually gone to the 'take photo' screen though; that's half the problem. It just thinks it has. Also, I forgot to mention that pressing the esc key no longer opens the menu like it usually does, probably because the game thinks it's taking a photo. I can open the menu manually though (like, by pressing the button).
Sounds like a different issue tbh. You will probably need to close down the game without saving
