In 6.4, the last example of “right-flanking but not left-flanking” is broken (it wasn’t flipped so it’s the same as the last one of “left-but-not-right”).
This should probably be on GitHub
Bah. You’re right. Done.
(I assumed that the fact that I got some “suggested similar posts” with similar sounding bugreports mean that it’s fine to posit it here…)
It’s fine to post it here for discussion, but it sounds like a bug that just needs to be fixed, which is best addressed as a github issue.