BUG in OCR in Acrobat 9.3 on MRC (Mixed Raster Content) PDFs

I have lots of (non-searchable) PDFs, that were generated from scanned images (1 image per page @ 400 dpi) using LuraDocument from www.luratech.de.
The images are stored internally in the PDFs as MRC (Mixed Raster Content), that means, the PDF contains a foreground and a background layer for every image/page. These layers have a low resolution, are highly compressed and merged together by Acrobat (while displaying) using a high resolution mask layer. This results in very low file sizes, about 50 kB / page.
I'd like to make these PDFs searchable, but WITHOUT manipulating or changing the original image layers in any way. OCR software like FineReader or Omnipage seems to store images always with own algorithms, so that the image quality would suffer from the conversion and the size of the PDFs would rise significantly. Acrobat on the contrary offers to maintain the original image(layer)s by using the output style "Searchable Image (Exact)" in the OCR window. Now the problem:
After starting OCR, Acrobat applies OCR only at the first page (with good results) and deletes (!) all content (the image layers) on all other pages. For my eyes this seems to be a bug.
I tried a workaround: In Acrobat's Layers Panel I choose the menu option "Flatten Layers". Starting an OCR now, Acrobat does OCR on all pages of the PDF, but the OCR result is a disaster, less than 10% correct. Presumably Acrobat does not take the resulting (actually displayed) page content as input for its OCR, nor the high resolution mask layer, but instead one of the (low resolution, highly compressed) image layers described above.
Has anyone made similar experiences with MRC-compressed PDFs, e.g. PDFs generated by other MRC-Generators like JRAPublish ? Is there any workaround or bugfix ?
Thank You in advance !
L.Benic

I'm having the same issues.  Using the latest version 9.3.3.  Is this a bug? I tired calling adobe but their CR sounds like 3rd country only.  Anyone can shed a light on this issue?

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