Nice scan! USDZ isn’t double sided. So the underside of the usdz model is transparent. Adding a shell modifier is one way of making sure its double-sided.
ashley July 21, 2019 (1:22 am)
Its now correctly aligned on the horizontal anchor in both iOS12 & iOS13 Beta. However, the scaling is different between the two version of iOS. Not much I can do about that unfortunately.