I was playing with this when Ultimate was on consoles but not PC. One of my corner combos no longer works or at least way too hard to hit on most characters. I finally hit it a couple of times on SZ specifically on PS4 so I thought maybe was just me off timing on consoles and a different monitor. I can't do it on PC now either.
I was doing b32 d1, 13 Auger, 13 MB Auger, 4, bladespin. Now the second 13 whiffs the s1. There was some very specific timing involved, but it worked fairly reliably, but not really at all now.
While they were different I was able to compare doing them side by side. Everything seemed the same with frames. All stuns and advantages seemed to line up. They seemed to fall at the same rates (had to adjust for the 4f getup change since they don't normally hit the floor when doing the full combo, but letting them gave me frame info)
I couldn't find an explanation for it, and it seems like maybe her s1 hitbox was adjusted but I don't see that listed on the patch notes. I don't think it matters given I don't think it's what other people do and probably wasn't true optimal, but I now have to see what other people do in the corner off of b3.