REST API POST to create Picture + file does not trigger the creation of the views

Tested agains 8?3 and SNAPSHOT (nuxeo-cap-8.4-I20160914_2325-tomcat)

in a server where CORS is enabled, use the API Playground to:
1. Upload an image
2. Send a POST request using the path, and create a Picture document that references the batch. Something like:
POST /api/v1/path/default-domain/workspaces/ws/folder
With body:

{
  "entity-type": "document",
  "type": "Picture",
  "name": "My Picture",
  "properties": {
    "dc:title": "My Picture",
	"file:content": {"upload-batch":"batchId-8c8803b3-c4d6-470c-9d2b-de7ffd212690","upload-fileId":"0"}
  }
}

he result is OK and no error is triggered. file:content does contain the file which can be downloaded. But picture:views stays empty, the views (and thus the thumbnail) are not generated.

Also, it is impossible to access the document from the JSF UI, it triggers an error starting with

2016-09-15 17:04:07,826 ERROR [http-bio-0.0.0.0-8080-exec-17] [org.nuxeo.ecm.platform.actions.DefaultActionFilter] evaluation of condition #{previewActions.hasPreview} failed: returning false
javax.el.ELException: Error reading 'hasPreview' on type org.nuxeo.ecm.platform.preview.seam.PreviewActionBean_$$_javassist_seam_51