Hi friends, maybe I'm missing something but I cannot see where to change the pixel aspect ratio correction button in my Comp panel. There is no option to change as we usually do. Not sure if this is a bug or something Adobe has "retired" in the latest release of After Effects.
I'd also recommend that you keep an eye on the After Effects Beta community board for changes like these. Be sure to provide feedback to the After Effects team wherever required. There are more posts like these where the After Effects team is looking for feedback.