BibTeX does not have the right entry for preprints. This is a hack for producing the correct reference:
@booklet{EasyChair:13282,
author = {Manuel Vierneisel and Lennart Frie and Peter Eberhard},
title = {Model Order Reduction – Also with Many Inputs and Outputs?},
howpublished = {EasyChair Preprint 13282},
year = {EasyChair, 2024}}