BibTeX does not have the right entry for preprints. This is a hack for producing the correct reference:
@booklet{EasyChair:2094,
author = {Rama Garimella and Alexander Rumyantsev and B K Krishna Kumar},
title = {Matrix Quadratic Equations: Algebraic Geometry},
howpublished = {EasyChair Preprint 2094},
year = {EasyChair, 2020}}