Inconsistent text formatting of Slack notifications for Jira

Issue Summary

Notifications in Slack is not rendered as per Jira's text formatting

Environment

• Jira Server
• Slack
• Jira Server for Slack (Official) app

Steps to Reproduce

1. Configure Jira to Slack as per this guide
2. Check the option to send a message to the channel when 'Someone leaves a comment'
3. Add a new comment and observe the message in Slack
4. Add another comment that uses multiple text formatting in Jira
5. Observe the message in Slack

Expected Results

Text formatting is preserved in the Slack message

Actual Results

Not all text formatting is preserved in the Slack message. As a result, message may be difficult to read in Slack.

Notes

Text formatting for Slack can be found in this link

Workaround

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