I did manage to reproduce this, but only under very specific circumstances:
- You must be saving from the VFB> Save All (it does not happen when the files are automatically saved on render end)
- You must manually add all render elements to the list in the EXR save dialog
What happens then is:
- The beauty is saved in EXR format with all render elements stored inside it (can be found for example in Fusion, but not in PS)
- Each single render element is also saved in EXR format with all render elements stored inside it (again this can be found in Fusion)
So if the same behavior can be triggered when rendering via BB/DR, then I suppose this would be the culprit.
We will look into it further, and will see if the same happens with other renderers. If it only happens when using Corona's "Save all", then it would be a Corona-only issue. I can't test it right now.