Comments from email with attachments trigger the 'Issue Updated' event instead of 'Issue Commented' event

Summary

Jira does not trigger the 'Issue Commented' event when the email reply has an attachment included.

Steps to Reproduce

1. Create a notification scheme where the Issue Updated does not trigger any notification.
   In this notification scheme, keep the Issue Commented event to fire notifications for the Current Assignee, All Watchers and Reporter, as default.
2. Create a project and use this notification scheme.
3. Reply to an existing issue through email - This reply must have an attachment included.
4. Check the issue to confirm that a comment was created.

Expected Results

Jira should trigger the Issue Commented event, and fire the notification to the recipients.

Actual Results

Jira will trigger the Issue Updated event.

Notes

• This problem seems to be a variant of JRACLOUD-41226
• These tests were done using the default mail server and the Comments from emails which is the default Jira mail handler.
• If the email has an image in the signature, that would count as an attachment.

Workaround

Edit the notification scheme to include the recipients in the Issue Updated event.