@lisawrites, thank you for the additional information! 😇 I was really hoping that @jpkarlsen's suggestion was causing the problem. At least we dont' have to mess with removing and testing your CC/Mods! It is so much easier to troubleshoot without those! 🤨
Since we have narrowed it down to the $100 Landscape option, I will test that in my game to see if I get your problem or not. 😉 I will also test some emotional paintings. I only tested the Small and Medium Classical paintings so far.
Edit: I just checked my game and since I already had my Sim in a "Very Playful" emotional state, I had them try a Playful painiting. They started, stopped to go to the bathroom and pet their cat, and they were able to resume painting. Then I tried the $100 Landscape painting. They started it, stopped, and then cooked and ate dinner, then resumed the painting without any problems. Therefore, I don't think this is a new bug (unless there is some other factor we aren't aware of that makes our experiences different.)
My game is up to date (with the latest update a couple of days ago). I have all the packs installed, but I do not have any CC/Mods either.
Try to have your Sim travel somewhere (where you actually follow them to their destination) and do something and then when you send them back home, try to have them resume painting and see what that does. If that doesn't work, then I would repair my game through Origin.
Please update us on what happens!
Best of luck! 😇