symfony/http-foundation supports partitioned cookies in 6.4+. However, the PSR-7 was failing to convert such partitioned cookies when creating an HttpFoundation Response because it used its own parsing logic for the Set-Cookie header instead of reusing the logic exposed by HttpFoundation (since Symfony 3.3), and that logic was outdated. I fixed that by using Cookie::fromString for the parsing of the cookie.

Note that the logic in the bridge was also only testing a few cases, while HttpFoundation has a more extensive test coverage for its parsing algorithm. And there is no reason to maintain such parsing twice (with totally different implementations)