Strange symbols {} in zotero export

Jack Ye
When I use export function in zotero, there's a chance output strings like title will contains this symbol {}.

For example, I output this item in BibTex format, and I will get this bib file.

https://s3.amazonaws.com/zotero.org/images/forums/u10924010/3xxpd0j9pscldanpf50d.png

@article{sengupta_bayesian_2024,
title = {A {Bayesian} approach to quantifying uncertainties and improving generalizability in traffic prediction models}, ...
}
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