Floating banners can be created by:
Placing a trapdoor on a wall
Ensuring the trapdoor is in its horizontal state
Shift clicking on the trapdoor with a banner in hand
Clicking the trapdoor so that it's in its vertical state
This creates a wall type banner that appears to be floating.
Possible solution could be to drop the banner when it is no longer supported, much like how signs drop.
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is duplicated by 3
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While this works for signs as well, I don't think it was intended. It may be intentional that the sign version of this has remained in game though.
Probably intended behaviour, just like the signs.