BibTeX does not have the right entry for preprints. This is a hack for producing the correct reference:
@booklet{EasyChair:8770,
author = {Alexej Pynko},
title = {Many-Fold Fuzzy Semantics of Many-Place Sequent Calculi with Enlargement},
howpublished = {EasyChair Preprint 8770},
year = {EasyChair, 2022}}