Workflow not being triggered by incoming email

Hello,

I have a SharePoint Designer workflow that triggers when a new item is created. The library the workflow is attached to specifically receives incoming emails. The workflow runs perfectly in our SharePoint 2010 environment, however, it does not run on incoming emails received in our SharePoint 2013 environment. If I upload a document into the library, it will run. It also runs if I manually start it. It just won't run automatically when it receives an incoming email. Is this a bug or is this to be expected with SharePoint 2013? Thanks.