CS5 Misinterprets Layered PSDs with Spot Channels

I haven't seen this mentioned yet; if you routinely use layered Photoshop files with spot channels, and might be opening older files into CS5 be warned that CS5 appears to misinterpret the tonal values in the spot channels of these documents.
Steps to reproduce:
Create a layered CMYK PSD file with one or more spot channels, and make sure that this file contains halftones on the spot channel(s), not all solid coverage.
Flatten the image and save a copy.
Place both images into Illustrator CS5. Notice that the spot channel(s) in the layered version appears much lighter than the flattened version (which matches the original image), and will output lighter as well.The CMYK channels display and output correctly.
Repeat the test with CS4. Both versions of the image will place and output identically from Illustrator.
Not sure what's going on here, but the only workaround I can find is to flatten the image. This could prove very dangerous when opening CS4 files that were set up this way into CS5, especially if the user is not familiar with how the file is supposed to look (prepress operators, etc.).
[Tested using CS5 and CS4, Mac OS X 10.6.x and Windows Vista.]
Additional info 3:39pm: if you start with a flattened image and add layers, retaining the Background layer, this issue does not occur. It is only if the PSD is "fully layered" with no flattened Background layer.

I don't actually see this but you
mention this happens with older files and I do not have any older files
like this so I really can't say.
No, this is with new documents created in CS5 as well. I referred to older files as they are my biggest concern -- if an older file was set up like this, with layered images containing spot channels, they are going to open and output different from CS5. And the likelihood of this going through to production without being caught is not insignificant. (These could be older files we have on backup that we're processing for a reorder, or from a customer who is using an older version of Illustrator...)
But I do like the idea that when you import a
photoshop with spot channels in CS 5 the spot channels are treated as
separate objects in the layers panel, rather than one collective object
like in CS 4. And that the spot color is properly set to multiply.
That is actually pretty neat, I hadn't noticed that (since we always link our images, rarely do we embed them). I'm not sure that Multiply mode shouled change the image data like this, and I'm also not sure how the file is handled by AI when it's linked... so I grabbed our film exposure bar and brought it into CS5 four ways (embedded / layered, embedded / flat, linked / layered and linked / flat) to test all variations.
The results are the same no matter how the file is placed; the spot content in the layered file is lighter across the board than the file, and the flattened version is correct.
(The forum resricts the size of attached images, and the resized image of the full test is a little difficult to see. I posted a second one below that, which is a close-up of a layered and flattened image showing the differences in the spot color data -- the lighter one is from the layered file, and is significantly altered from the original file.)

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