DITTO!!!!! What an irritation this is.
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On what platform?
Photoshop writes the image data out in the preview.
But we know that MacOS in particular has serious problems in their image previews (mixing up alpha channels with transparency, failing to use previews and replacing previews with misread data, failing to read all color modes and bit depths, etc.).
I've seen this happen in both OS 10.4 and 10.5. I haven't been able to compare apples to apples on a WinXP or later machine though. I thought it would probably be an OS issue, but wanted to bring it to attention anywho, thanks for the confirmation.
Yes, you're looking at an OS issue.
We've filed several bugs with Apple about their image preview code, and every major OS, they fix one or two of them.