I am speaking from a software developer perspective as I report this new issue since the last update.
When the game starts, it determines the default audio of the system and uses that for sound output. There should be error trapping routines on code sections that output to the audio device. It seems to me that when the audio output device is changed WHILE the game is already running, the error trapping routine no longer checks what the new audio output device is. So if I started the game using my external Bluetooth speakers, AND THEN turned on my Bluetooth headset (which my laptop recognizes and properly overrides my external Bluetooth speakers with), Sims 4 loses sound. Prior to the update, Sims 4 knew how to handle this situation and properly routes sound output to the new active sound device (i.e., my headset). But now, the sound disappears and trying to exit the game just causes Sims 4 to hang as if it's still trying to output sound to a disabled sound device. As a result, the game can't exit normally and just hangs; I'd either have to choose the "Close" application option as the game grays out or end the task via the Task Manager to exit the game.
I very quickly noticed this because I switch back and forth often between my external Bluetooth speakers and my headset, and Sims 4 had always properly changed to the active device. This adaptive functionality disappeared since the last update.
Please fix this and restore it back to the way it was because it's now a pain dealing with this as I have to exit the game fully BEFORE changing active output sound devices.