Ever since my first encounter with PolicyKit back in the early days of its inclusion in Debian, ages ago, I've had a very bad impression of its implementation quality.

Back then it would segfault randomly for no apparent reason, idle freshly installed fairly minimalist headless fileservers. We immediately blacklisted it from our systems, but were lucky to not actually need anything it brought to the table.

IIRC for quite some time there wasn't even a maintainer, but I think that was pre-polkit rename. Hopefully the situation has improved.