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I thought I was alone! Cycling inputs doesn't even work for me, I must unplug the monitor physically. Not even BetterDisplay can fix it.

We have one particular model (P2419HC) of Dell display at work that seem to do this.

As best as I can tell, there's some kind of active component in the USB-C cable that is only powered by the monitor, and it doesn't "reset" itself properly.

Plenty, but fortunately the fix is just an unplug+replug. In the past, the secondary display kept working but a sneaky kernel task took over 200% CPU, and you had to 1) realize the computer is feeling even more sluggish than normal 2) know what the heck kernel task is 3) know that un/re-plugging will fix the CPU load

https://www.youtube.com/watch?v=_kppD1PotFw