FileManager.Import prevents saving changes

I have an Automation Script that runs during a "Before document modification" event. As part of this script there is a call to `FileManager.Import`. When this call is made, changes to the current document are no longer saved. If I remove the `FileManager.Import` call, changes are saved as normal.

I will provide an example Studio project.

Steps to reproduce:

• Create a Workspace
• Create a Message
• Edit the message (open Edit dialog)
• Notice that changes to dc:description work; the value is automatically updated using Fn.getNextID()
• Upload a file in the provided Nuxeo Dropzone
• Notice that changes to dc:description are not saved