Support question

In a recent update, Doctrine added psalm/phpstan annotations, which now makes phpstan find the following error:

https://phpstan.org/r/e462e0f9-abc4-44bc-8a9a-80aca2717980

I've tracked down the change that most likely causes this, and it seems the Doctrine people could not fix this error so they put this error in the ignore section: https://github.com/doctrine/dbal/pull/3977/files#diff-0847156bd64b0de0f4d91da2394ec0e8R89-R92

My question is: what is this error exactly, is there a way to fix or work around it and if not: do I really need to ignore an error caused by a third-party library?