I really liked An. To me, she is the best Chinese skater since Lu Chen (way before your time as a skating fan... like... that was in another century). I think her score might have been affected by two things : 1) not as well known by judges and skating early 2) her combo was 3t-3t. In juniors, when the mandatory jump is the loop, it does make a relevant difference compared to seniors or can swap their lutz as a solo jump (or juniors in years, like next year, where the solo jump is the lutz)
An 4.2 +4.2 + 4.9 =13.3 BV
Senior skater using same combo but with Lutz as solo jump 4.2+4.2 + 5.9 14.3 BV
Junior skater with lutz combo and mandatory loop 5.9+4.2 + 4.9 = 15
We can see here the difference in BV when the loop is mandatory 1.7 over the 3t-3t versus 3lz-3t layout
In seniors, someone with a 3t-3t but able to do a lutz will recuperate a bit of this disadvantage, and only trail by 0.7 points in BV over a skater doing 3z-3t and 3loop.
Of course, there are other layouts with the flip but I thought it would be simpler to illustrate this version which is what may have been a factor in An's score : about 2 points which would have made her much closer to the SP podium.