Hello!
First of all, to all maintainers, THANK YOU! for maintaining this great OS, really.
Now on to business, I'm on Solus budgie and I've found that if the power button action is set to shutdown, it won't do anything, it used to show the shutdown prompt and with a second press, it actually did the shutdown. My guess is something kinda broke with a gnome update.
I've tested it with 2 different machines (desktop and laptop) with the same result. It's no big deal and i don't know if this is on purpose but i just wanted to let you know.