[WJW]

Somehow it interfered with legacy code governing determination of in and out (C-)groups and led to multiple crusades and other various mass killings along the way. Optimal code in isolation, not so perfect in a wider system.

[inopinatus]

There is a known bug in production due to faulty wetware operated by some customers.

[miningape]

Nah it's a feature, you're just not using it properly