BibTeX does not have the right entry for preprints. This is a hack for producing the correct reference:
@booklet{EasyChair:7918,
author = {Xu Hwanwg},
title = {Security and Privacy Concerns in IoT Devices and Attacks in Smart Cities},
howpublished = {EasyChair Preprint 7918},
year = {EasyChair, 2022}}