I managed to somehow have a path constraint that listed one of the bones twice. It took some time before I realized because I did not think this was possible and it can be a bit hard to notice: The list is potentially long, the icon behind the bone name only shows if a bone is listed in a path or not and there is no "warning" when doing it.
Context: Using path and bones information in Unity was double listing a bone and I could initially not figure out why. I assume it's not intended behavior, since a bone only have a single position on a path?