I see from this post that the footnote thingy has changed.
Let’s see [1] and also, [2].
This appears to now be a mixture of the 2 previous incarnations, wherein
you could either have an inline “footnote” which showed up as a button
with 3 dots on it which would reveal the note when clicked, or a real footnote
type option with a number with an associated footnote at the bottom of
the post.
The worst of both worlds !