Not sure if this counts as a bug per se, but someone needs to let Blizz know about this.
A lot of people including me have been experiencing increased input lag since new patch, mostly in dungeons (mythic plus) and in main city as well. The in-game ping shows the same low ms (~35ms), but when I press my skills it feels like there is a 100-200ms delay.
I think the best way to describe it is a combat input lag. It doesn’t show in the latency meter. With very low ms and high fps, this minor input lag still occurs almost constantly, and it started with the 11.0.5 patch.