I've had this happen also, when leaving the Manage Worlds screen or just traveling to another lot. It will sometimes hang on the loading screen. But I haven't seen any kind of pattern to it. When it hangs I have to use crtl-alt-del to bring up the task manager and force close The Sims 4 and when I go back into the game and try to travel to the same place again it will work fine.
But for me it's not related to the patch sense it was happening to me before the patch.
I just make sure to save the game before doing anything that opens the loading screen. Like manage worlds, travel or going into CaS.