Markdown bold not working for words starting or finishing with lowercase 's'

Summary

In the new editor, the markdown does not works (either ""__"" or "**" ) for words that starts or ends with the lowercase char "s".

Steps to Reproduce

1. Create or edit a page;
2. While editing a new page, use the markdown to set a word to bold, the word must start or finish with the lowercase 's' char.

Expected Results

The content should be formatted to *bold*

Actual Results

Nothing happens.

Workaround

Use the editor tools to make a text bold.