I tried it on as a female highlander Hyur, and got the hole. I pulled it out of my armoir, dropped it into Gpose, and put on max lighting.

The hole is like a giant splotch of vantablack. That's not a lighting issue, it's definitely a model issue.



But if I had to make a guess, it was a deliberate change, because they reused the model rigging for a different scythe where that shadow makes sense, without realizing it would impact this one this badly.