I was just using the footnotes feature provided by the Footnote shortcut. I do not use this function all the time - mostly when I import scientific articles that make use of this feature. So it is a while back since last I used it
What I now realised:
inserting footnotes still works fine
The footnotes are there in editor mode
When I switch to reading mode, the footnotes block at the end will vanish and the reference inside the main text is converted to an ordinary number
Things I have tried
I tried deactivating all sorts of plugins and CSS hacks but the footnotes in reading mode do not come back.
Ok, this is weird. It seems that somehow, inserting one more footnote after the first one will not insert a proper linebreak between the two footnotes.
This apparently leads to all footnotes after number one not being displayed in reading mode.
Also, this happens with every next footnote again.
Manually inserting linebreaks after each footnote at the bottom fixed the problem.
It is weird since the plugin always worked nicely but somehow now seemed to keep out missing spaces in between footnotes. As soon I manually added them, the rest of the footnotes magically appeared …