Some non-breaking spaces are converted to ` ` by seemingly unrelated edits performed by WikEd ([[https://en.wikipedia.org/w/index.php?title=Parkinson%27s_disease&type=revision&diff=791796008&oldid=791791493|example]]).
* [[https://en.wikipedia.org/wiki/User_talk:Cacycle/wikEd#Stop_adding_ |https://en.wikipedia.org/wiki/User_talk:Cacycle/wikEd#Stop_adding_ ]]
It seems that when content is copied from a page that was edited with VE, nbsp characters are added to the clipboard, which thus sneak into the wikicode version as people copy the content into a wikicode editor. While this is NOT proper copy paste behaviour for article content, it is common.
# Which browsers are affected?
# Does this happen when copying from the edit surface, from the View AFTER save surface, the preview surface ?