WD ALV: Image in server cache does not appear in Excel

Hello WD Experts!
I have a Web Dynpo ALV table with material master data. One column contains the image of the product or a "sorry, no picture" image, if no specific material image exists.
The images are not available as MIME objects, hence I load the images from an external source and push them into the server cache using the method cl_http_server=>server_cache_upload( ... ). The lifetime for the cache is defined with 600. The "sorry, no picture" -image is a MIME object.
All works fine... except for the download to Excel. Only the "sorry, no picture" -image appears. The others gets replaced by a placeholder icon which looks similar to those frequently seen in emails or slow web pages.
Why don't the cached images get downloaded to Excel???
Best Regards
Bodo

Has to be programmed manually because WD ALV does not read from server cache

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