Non-breaking space before inline reference/footnote not preserved in wiki node changes output

[Ambient-Impact]

It's unclear if this is just in some cases or all cases, but a good example is in the Assassination of Xu Shaoyong and Yuri Golitsyn changes:

Note the "[6]" wrapping to a new line. One solution may be to rework the non-breaking space as a <span> that wraps just a plain space, which should be preserved easily and can be made non-breaking via CSS.

Non-breaking space introduced in 0edeb03

We don't currently use the Typogrify module, but it may be worth looking into, if only for how it handles non-breaking spaces. It's unclear if CommonMark works well with this module or conflicts.