Blending 32-bit images into panorama clips brightness in CC (Windows)

Hi all,
I'm running Photoshop CC on Windows and am trying to stitch a HDR panorama. I have several 32-bit HDRI images, and I can open them individually and see that the full range of brightness is present by reducing the exposure and seeing the detail come up in the bright areas.
However when I try to run them through Photomerge, I end up with an image that has the brightness clipped - reducing the exposure no longer brings out the highlights in the bright areas.
The culprit seems to be the auto-blending part of the process.
How can I blend 32-bit images to end up with a panorama that has the same dynamic range as the original images? There doesn't seem to be much point having panorama support for 32-bit images if it clips the dynamic range. Am I doing something wrong?
Thanks in advance
-Matthew

It's been out for months.
You're using CC, not CC 2014 -- it may already be installed, and you're just launching the wrong version.

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