Jira is sending two notifications from comments on Slack

Summary

Jira is sending two notifications from comments on Slack

Steps to Reproduce

1. Set up a Slack integration which includes notifications when someone leaves a comment:
   
2. Comment on one issue.

Expected Results

The message is triggered once on the Slack room, as expected.

Actual Results

The Slack room receives two notifications from each comment.

Workaround

None