Year old (March 2024) article about small numbers of paint scratch, storage mold, and other minor issues in a large number of deliveries from a rapidly expand manufacturer concludes:

   But it’s too early to gauge if these quality problems are false alarms or something BYD needs to take very seriously.

(also The unlinked primary source for much of that material was the WSJ: https://www.wsj.com/business/autos/having-overtaken-tesla-by... )