No nothing. Also, forgot to mention another test, went to hibernate while the sound playing through laptop's speakers, plugged in headphones while the machine is off, started the machine. Sound was coming through the headphones after the boot. I'm on a t450s.

I think that's a vendor implementation. I used a Lenovo for a long time, worked perfectly without a pop-up. Just got a Dell XPS 15, it pops up a prompt when I plug stuff in (but it also allows me to set a default behavior, so.... ‍️

No, never experienced them on my machine while switching between headphones and external speakers. Maybe you have some misconfigured driver?