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I haven't had a chance to update yet, but my immediate thought is that there might be a size limit since the icon has to fit within the table's line height.
Otherwise larger icons might appear to display nothing when, in fact, they're simply showing clear/unused pixels in the corner of the icon image.
I cannot recall if there is a line height option in calibre's settings, but you could try playing with it a bit (and perhaps the icon column width) to see if the icon re-scales itself. I assume there is some kind of automatic aspect ratio re-scaling which is why I'm suggesting changing the cell size.
Hope this helps.
PS: LOL! I see Chaley beat me to posting.
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