The banner has the bounding box of signs, thus an incorrect height. Anything you try to place on it (like mob heads) is placed in the middle of the banner.
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Is there anyone that thinks that this is a bug, or is the community consensous that this is intentional?
@Searge
Banners should be either one or two blocks tall, but currently they are sort of halfway. Blocks can be placed inside the top part, but liquids don't flow through it. Something here is clearly wrong.
michael
Screenshot for visualization