Why can't Traktor send audio to my speakers with correct audio device and output routing?

Subtitle: Any known issue with recent Windows 11 updates?

I went to make a mix this morning only to discover that Traktor Pro 3 now can't play audio out of my laptop speakers. My laptop speakers aren't receiving any audio signal from Traktor Pro 3. At the same time, Traktor Pro 3 is successfully sending audio signal to my headphones. Also, and my speakers are perfectly receiving audio signal from other apps (e.g. YouTube, as shown below).

In screenshots below, you'll see that the Windows WASAPI (shared) audio device is selected, that the output monitor is headphones (L/R), and that the output master is speakers (L/R). Changing WASAPI to "Exclusive" does not fix anything, nor does changing just about every setting in output routing or audio device.

I used these same settings to successfully record a mix six days ago. At that time, Traktor Pro 3 had no problem playing audio through speakers and headphones. Since then, my computer installed a Windows 11 update. No other apps appear to be affected. But now, Traktor Pro 3 doesn't appear able to send audio signal to my speakers.