Issue Summary

When two or more letter styles (such as bold, italic, etc.) are applied to special number characters (such as "CIRCLED DIGIT ONE" (①), "DIGIT ONE FULL STOP" (⒈), etc.) in wiki style text field, styles don't work as expected.
They work when applied to spacial Latin letters (such as "CIRCLED LATIN CAPITAL LETTER A" (Ⓐ)).

Steps to Reproduce

1. In a Jira comment field, enter a character '①' (it might be easy to copy and paste from this page)
2. Apply "Bold" style, then "Underline" style to the character, then click "Add" button

Expected Results

The bolded and underlined character '①' is displayed in the submitted comment.

Actual Results

Characters 

+①+

with '①' is bolded were displayed in the submitted comment.

The result depends on the order of style application. If the order is "Underline" then "Bold", the result is

*①*

with '①' is underlined.

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available.