Despite the fix in the https://jira.xwiki.org/browse/XCOMMONS-929, there are still some wrongly rendered spacial chars.
The following symbols gets broken by the editor:
¹ ² ³ ½ ¼ ¾ ∴
which are represented by these entities:
I tested it on XWiki version 10.11.1 with WYSIWYG editor using Insert Special Character button.