While I 100% agree that the 3z-3t should have gotten a > call I'm going to speculate as to the reason it didn't get called just for the sake of discussion.
1) She landed with her body fully rotated and it looked like her foot just got jammed up and caused the hook. It's an odd hook too. Very quick and TBH for me it was hard to spot in real time. She masked it pretty well IMO and clearly got away with one. A lot skaters who hook do so on the pick more and actually turn the body with the UR making it easier to spot. Or in other words...most easily spotted UR jumps are hooked on the toe with the ankle and somehow this oddball was almost pivoted with the center of gravity over the heel....some how. Just speculation mind you
2) She isn't very well known for edge calls or UR's and so the panel may not have been looking as closely as they should and since it looks much much better in real time that they just didn't go back and double check. In other words no one flagged it for replay somehow and it just got lost in the shuffle. Another form of reputation judging if you will but this time in the skaters benefit.
FWIW: We all can see the UR and I'm sure if we are spotting it others will to going forward including members of the ISU. I'd being willing to place a bet that we'll be waiting a few seconds longer for Masha's scores in the KnC going forward. If I get time I'll go back and see if I can find some previous UR issues from her in the past but to my knowledge she not only has great edge jumps but has always had fully rotated jumps.
I didn't see very much of this event but of the few skates I did see I clearly remember Wakaba getting a freebie in the SP for her flip which looked like an (e) to me. Maybe the tech panel just isn't very consistent although there is probably a case of giving Wakaba a break after her unfortunate SP it still shows that they are missing things.