@burnout426 hey, appears it was some kind of glitch with my system - now Opera plays all resolutions, as well as Vivaldi (Video Acceleration Information or any other params didn't change).
I'm trying to reproduce the issue again, but for now it just started working lol (and I didn't even reboot this time)
My apologies for taking your time, and thanks for your input on the issue. I'll write back if I have more info.