Be very careful when tightening the yellow standoff screw in the upper left corner, i.e. on the right side of the frame below the camera. This screw not only holds the logic board but also the NFC antenna. The antenna must be placed on top of the logic board to make contact with a small metal plate on the board. It is very easy to place the antenna below the board, in which case the NFC (i.e. ApplePay) won’t work anymore.
My replacement display from the ifixit kit is slightly thicker than the original. It is hard to spot, but you will feel it when using the home button.
Found it - it can be seen on the photo of step 22 right above the QR code.
Same here. Anyone any idea where it belongs?