That’s a classic challenge with Word-based reporting. Usually, when images aren't showing up in the footer, it’s because the docxImage helper is struggling with the specific scope of the footer part in the XML.
One thing that often helps is making sure the image data is already fully resolved in your data object before the rendering starts. Also, double-check that you're using a relatively small image file - sometimes the footer container in Word is a bit more sensitive to large base64 strings than the main body is. If you've already tried that, sometimes wrapping the image in a fixed-size table cell in the footer can help "force" the rendering engine to reserve the space properly!
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