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@HanFox - I kind of figured it was something along those lines (no pun intended.) You'd never notice it unless you happened to place a shulker box on top of a grass block that just so happened to have the flowers, and then open it while looking downward, which I happened to do when I noticed this.
I'll patiently wait for the next revision. You guys rock!

I've also added some CEM magic to make the shulkers actually have thickness. Will also be in next release (and will need OF to display)