Mail Handler wrongly creates new issue instead of adding comment to an issue moved to a different project

Summary

The SD Mail Handler creates a new issue when it actually has to add a comment to an existing issue. The issue was moved to a different project

Steps to Reproduce

1. Create 2 SD projects (SDA and SDB)
2. Set up Outgoing Mail for JIRA
3. Set up incoming email for SDA
4. As a customer, create a request via email
5. As an agent, move the request to SDB
6. As an agent, respond to the customer on the ticket which is now in SDB
7. Customer will receive an email from the comment by the agent
8. As a customer, reply to this email

Expected Results

1. The reply should be added to the same issue which is now in SDB

Actual Results

1. The reply creates a new issue in SDA

Notes

1. Tested in JIRA 7.1.8 with SD 3.1.9. Results are that the reply is added as a comment (expected results)
2. I have personally only tested this in 3.2.1 but there are reports where this is affecting 3.2.2 as well

Workaround

No known workaround