I was writing some signs on my house, but I accidentally placed two signs in one spot. I saw that one was floating of the wall. The sign did not break like it's usual behavior.
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This is same with many other polygon blocks.

Working as intended.
As you can mount paintings on every block, the same applies to signs.
The two inner signs are the "holding block" for the outer signs, if you destroy the inner signs, the outer signs drop as well.
As you see in my attachment, the signs are connected to each other, but do not seem to touch. The floating signs should be falling off as dropped items, but they're not.