When typing commit messages with characters such as below:
Did work for issue 12345.
*Did task A
*Did task B

Bitbucket commit page would interpret change Did task A to italic due to Markdown text being enabled on that page.
The same behavior would not be seen within the commit itself.

Since using asterisks in Git commit messages to itemize seems to be one of the established conventions the user believe the markdown text formatting should be removed from the commit page.