Duplicate filenames aren't handled well

When a new node is created and you upload an image with an already existing filename in another node, after uploading and before saving, the old filefield_thumbnail is displayed in the browser (this is NOT a browser caching problem).

I use these modules:

FileField 6.x-3.0-rc1
ImageField 6.x-3.0-rc1
FileField Paths 6.x-1.0

Images are uploaded to node-type 'objects' using filefield_paths and this path:

/web/sites/default/files/imagefield_thumbs/objects/[nid]/

Here's how you can recreate this:
1. setup a content type 'objects'
2. add a cck imagefield and setup the path like above
3. number of images is unlimited in my case
4. I also use transilaterion and to lowercase in the settings.
5. create a node and upload an image 'test123.jpg'
6. save
7. create another node and upload a different image with the same name 'test123.jpg'.

Now you will see the thumbnail of the image in the first node, which would be located in .../objects/[nid]/test123.jpg
You can check the image path here to verify this.

Next, if you save the node and edit - you will see the right picture. (because then its moved to the right folder)

I think the image should get renamed to 'test123_0.jpg' in step 7 but isn't? This renaming only seems to occur when you upload the duplicately named images in the same node.